10 exercises — using "by definition" to ground claims in the meaning of a technical term, contrasting it with "in practice," and distinguishing it from hedges and near-synonyms.
Quick reference
By definition: a claim that is necessarily true given what a term means, not an empirical observation
Position: mobile — sentence-initial, mid-sentence (comma-set-off), or sentence-final
Contrast pair: "by definition" (spec/design truth) vs. "in practice" (real-world behavior)
Near-synonyms: inherently, necessarily, intrinsically, by its very nature
Don't confuse with: apparently/presumably (hedges), by and large (generalization with exceptions)
0 / 22 completed
1 / 22
A staff engineer explains a design constraint: "A stateless service ___ cannot retain session data between requests." Which phrase correctly signals that this follows necessarily from the meaning of the term, not from a separate observation?
By definition marks a claim as true simply because of what a word or concept means — it signals "this follows necessarily from the meaning of the term itself," not from an empirical observation. "A stateless service, by definition, cannot retain session data" — this is true by the very definition of "stateless." "By the way" introduces an unrelated aside (wrong meaning). "By and large" means "generally, with exceptions" — the opposite of a necessary truth. "By all means" grants permission ("Sure, go ahead") — completely unrelated.
2 / 22
Which sentence uses "by definition" correctly, marking a claim that is true purely by the meaning of a term?
"A singleton, by definition, has exactly one instance throughout the application" — this is correct because having exactly one instance is literally part of what the word "singleton" means; the claim is definitionally true, not an empirical fact about a specific system. The other sentences describe empirical, contingent facts (how many times something crashed, how long a deployment took, how hard a specific bug was to reproduce) — none of these are true "by definition"; they are true because of what actually happened, so "by definition" is misapplied there.
3 / 22
A code reviewer pushes back on a comment: "You said this function is idempotent, but calling it twice changes the database state — that's ___ not idempotent." Which phrase best emphasizes that the behavior directly contradicts the term's meaning?
"...that's by definition not idempotent" strengthens the claim by appealing directly to what "idempotent" means: since idempotence requires that repeated calls produce the same state, a function that changes state on a second call fails to meet the definition — no further argument is needed. "In theory" would weaken the claim by suggesting it might not hold in practice — the opposite effect. "For the record" is a discourse marker for noting something for future reference, unrelated to definitional truth. "As it were" is a hedge softening a metaphor ("so to speak") — also the wrong function here, where the point is to be maximally certain, not hedge.
4 / 22
Which position(s) can "by definition" occupy in a sentence while remaining grammatical? Consider: "[X] a race condition [Y] involves at least two threads accessing shared state [Z]."
By definition, like many sentence adverbs/disjuncts (e.g., however, in fact, essentially), is mobile: "By definition, a race condition involves..." / "A race condition, by definition, involves..." / "A race condition involves at least two threads accessing shared state, by definition." All three are grammatical and carry the same core meaning, though sentence-initial or mid-sentence placement (set off by commas) is more common and reads more naturally in technical prose than the sentence-final position, which can feel like an afterthought. Regardless of position, commas are required to set the phrase off from the rest of the sentence.
5 / 22
Which sentence pair correctly contrasts "by definition" (definitional truth) with "in practice" (empirical reality)?
"By definition, HTTP is stateless; in practice, cookies and tokens are used to simulate state..." This is the idiomatic contrastive pair: by definition states what is necessarily true given the protocol's design, while in practice pivots to how systems actually behave in real-world use, which may work around or supplement that definitional fact. This pairing is extremely common in technical writing for flagging the gap between spec and implementation. Option B wrongly claims cookies simulating state is also a definitional truth (it is not — it is an engineering workaround). Option C swaps the logic backward. Option D crams both markers onto the same clause, producing a contradictory, garbled claim.
6 / 22
A postmortem includes this line: "The retry mechanism, ___, cannot cause data loss, since every operation writes to an append-only log before acknowledging." Which phrase most precisely signals that the safety guarantee follows logically from the design, not from luck?
By definition asserts the strongest possible epistemic stance: the guarantee is not a matter of appearance, assumption, or claim — it follows necessarily from the append-only-log design being described. "Apparently" and "presumably" both hedge the claim, suggesting it seems true or is assumed true but isn't verified — the opposite of the certainty intended. "Allegedly" implies the claim is disputed or unverified, often used skeptically — entirely wrong tone for a postmortem stating an engineering guarantee.
7 / 22
Which sentence misuses "by definition" by attaching it to a claim that is actually just common or typical, not logically necessary?
"Most production outages, by definition, happen on a Friday afternoon" misuses the phrase: this is a joke about observed frequency (an empirical, statistical pattern — or a superstition), not a truth that follows from the meaning of "outage." The correct connector for that idea would be something like "it seems" or "anecdotally." The other three sentences are genuine definitional truths: purity entails no side effects, immutability entails no post-creation modification, and a null pointer dereference is defined as accessing a reference to no object — all follow necessarily from the terms themselves.
8 / 22
Choose the best synonym for "by definition" in this sentence: "A deadlock, ___, requires a cycle of processes each waiting on a resource held by another."
Inherently is the closest synonym here — both signal that a property is built into the very nature of the thing being described, not incidental to it. "A deadlock inherently requires a cycle of processes..." carries nearly the same force as "by definition." "Occasionally" (frequency), "seemingly" (appearance, hedge), and "coincidentally" (chance) all describe contingent, non-necessary relationships — the opposite of what "by definition" and "inherently" both express. Other near-synonyms worth knowing: necessarily, intrinsically, by its very nature.
9 / 22
Which sentence correctly uses "by definition" to preempt an objection in an architecture discussion?
"...a facade pattern, by definition, wraps multiple subsystems behind one interface — that's the whole point" correctly uses the phrase to preempt an objection: it shows the apparent "violation" is actually inherent to what a facade pattern is, so the criticism misapplies the pattern's intended purpose. Option B pairs "by definition" with an unrelated claim about a decision not yet made — no definitional content at all. Option C hedges with "might," which contradicts the certainty "by definition" is supposed to convey — a definitional truth cannot be merely possible. Option D uses "by definition" to introduce a recommendation ("we should"), which is a judgment, not a necessary truth — the wrong grammatical/logical role entirely.
10 / 22
Which explanation best distinguishes "by definition" from "technically" in engineering discussions?
"By definition" grounds a claim in the accepted meaning of a term and is usually offered constructively, to clarify. "Technically" often has a slightly different, more pedantic flavor — it frequently introduces a narrow, literal reading that undercuts or complicates a broader claim someone just made ("Technically, the SLA doesn't cover this edge case, even though it's clearly in the spirit of the agreement"). They can overlap, but "technically" carries a stronger implication of "strictly speaking, contrary to what you might assume," while "by definition" more neutrally states a necessary truth. Neither is restricted to a single field, and "technically" is not more formal — if anything, it is the more conversational of the two.
11 / 22
David (Tech Lead): "This new feature is *thread-safe*, meaning that concurrent access from multiple threads won't cause data corruption.". Which phrase most accurately emphasizes the logical necessity of thread-safety based on its definition?
The correct answer captures the essential meaning of 'thread-safe' – that it *by definition* handles concurrent access without corruption. Options A are a general recommendation; B restates a consequence; and C offers an oversimplified explanation of what thread safety means.
12 / 22
David (Tech Lead): "This new feature is *thread-safe*, meaning that concurrent access from multiple threads won't cause data corruption.". Which phrase most accurately emphasizes the logical necessity of thread-safety based on its definition?
The correct answer captures the essential meaning of 'thread-safe' – that it *by definition* handles concurrent access without corruption. Options A are a general recommendation; B restates a consequence; and C offers an oversimplified explanation of what thread safety means.
13 / 22
David (Tech Lead): "This new feature is *thread-safe*, meaning that concurrent access from multiple threads won't cause data corruption.". Which phrase most accurately emphasizes the logical necessity of thread-safety based on its definition?
The correct answer captures the essential meaning of 'thread-safe' – that it *by definition* handles concurrent access without corruption. Options A are a general recommendation; B restates a consequence; and C offers an oversimplified explanation of what thread safety means.
14 / 22
David (Tech Lead): "This new feature is *thread-safe*, meaning that concurrent access from multiple threads won't cause data corruption.". Which phrase most accurately emphasizes the logical necessity of thread-safety based on its definition?
The correct answer captures the essential meaning of 'thread-safe' – that it *by definition* handles concurrent access without corruption. Options A are a general recommendation; B restates a consequence; and C offers an oversimplified explanation of what thread safety means.
15 / 22
During a Slack discussion on performance optimization, Ben says: "This caching layer is immutable, by definition, meaning its state cannot change after it's created.". What does Ben's statement primarily emphasize?
Ben uses 'by definition' to assert that immutability is a core characteristic of the caching layer. This isn't simply about *implementing* an immutable cache; it's about the logical consequence of the term itself – immutability *by definition* implies predictable and reliable behavior, crucial for performance optimization in this context. Options A, C, and D shift the focus away from the essential meaning.
16 / 22
During a standup meeting, Sarah states: "The database schema is normalized, by definition, meaning data redundancy is minimized to improve data integrity and efficiency.". Which of the following best captures the intended emphasis?
Sarah uses 'by definition' to highlight the fundamental purpose of normalization – minimizing redundancy. It's not about faster queries or reduced storage (though those can be benefits); it's about the *logical* consequence of the term itself. Option D is a more descriptive explanation than a definitional one.
17 / 22
A technical document reads: "The system uses optimistic locking, by definition, meaning it assumes conflicts are rare and only checks for them at the end of a transaction.". What is the primary point being made?
The document uses 'by definition' to emphasize that optimistic locking's core principle is based on a specific assumption: rare conflict scenarios. This isn't about efficiency or frequent checks; it's about the *logical basis* of the technique. Option A presents an unsupported assertion; options B and D misinterpret the mechanics.
18 / 22
A developer is explaining a new feature to their team. They state: "This module is stateless, by definition, meaning it doesn't maintain any client session data.". What does this statement primarily convey?
The core meaning of "by definition" here is about a fundamental characteristic: statelessness. The other options describe potential design choices or optimizations, not the defining feature being emphasized. It's crucial to understand that 'by definition' isn't just stating something as fact – it's highlighting a key, logical requirement.
19 / 22
In a Slack discussion about data validation, Maria says: "A valid email address must contain an @ symbol, by definition, meaning it's structurally recognizable as an email.". What does Maria's statement primarily illustrate?
Maria is using "by definition" to establish a core requirement – the '@' symbol. While the other options touch on related concepts (validation, RFCs), they don't represent what 'by definition' is conveying about email structure. It's focusing on the *logical necessity* of that symbol.
20 / 22
John: "The API endpoint returns a 404 error, by definition, meaning the resource doesn't exist.". Which of the following best explains John's statement?
John correctly uses "by definition" here. A 404 error *logically* implies non-existence. Options A and B introduce potential causes (network issues, blocking) which are not part of the definitional meaning. Option C is incorrect; a 404 simply states absence.
21 / 22
Alice (Senior Engineer): "The microservice handles user authentication, by definition, requiring it to securely verify user credentials and generate tokens.". What is Alice's primary focus?
Alice uses "by definition" to highlight the *essential* requirements of an authentication service. A key aspect is securing credentials and generating tokens - these are logically necessary components. Options A, B, and C represent additional desirable qualities but aren't core to the definitional meaning.
22 / 22
Standup Update: "The new feature employs a functional programming paradigm, by definition, emphasizing immutable data and pure functions.". What is the central emphasis of this update?
"By definition" directs attention to the *core* principle of functional programming: immutable data and pure functions. These are logically necessary for achieving the paradigm's benefits – namely performance optimization in certain scenarios. Options A, B, and D are possible outcomes or design choices *influenced* by this paradigm.
What will I practise in ""By Definition" as a Logical Marker — IT English Grammar"?
Practice using "by definition" to mark claims that are necessarily true given a term's meaning, and how it differs from hedges like "apparently"
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This module has 22 multiple-choice exercises, each with instant feedback and a full explanation of the correct answer.
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