Requirement vs Specification

When to use each in English, with meaning, register, and examples.

Requirement

Top 1,000 (very common)B2noun

Specification

Top 3,000 (common)C1noun
Most common: Requirement
 RequirementSpecification
Pronunciation🇬🇧 /["/rɪˈkwaɪəmənt/"]/🇺🇸 /["/rɪˈkwaɪərmənt/"]/🇬🇧 /["/ˌspesɪfɪˈkeɪʃn/"]/🇺🇸 /["/ˌspesɪfɪˈkeɪʃn/"]/
MeaningSomething you need or must have.A detailed description of something's features or requirements.
ExampleThe job listing stated that a degree in engineering is a requirement for applicants.the technical specifications of the new model *(= of car)*
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 3,000 (common)
CEFR levelB2C1
Part of speechnounnoun
Collocationsabsolute, necessary, core, have, comply with, fit, for your requirement, to your requirement, requirement for, subject to the requirements (of something), surplus to requirements, absolute, necessary, core, have, comply with, fit, for your requirement, to your requirement, requirement for, subject to the requirements (of something), surplus to requirementscomplete, detailed, full, develop, draw up, write, according to the/​your specifications, to the/​your specifications
Antonymsoption, choice, voluntaryvagueness, ambiguity, generalization
Common mistakesConfused with 'require' — remember it's a noun, not a verb., Omitting articles — 'a requirement' instead of 'requirement'., Using 'requirements' mistakenly with plural agreements when singular is needed.Confused with 'specifically' — they have different uses., Using it in informal contexts where simpler words work better., Mistaking it for 'speculation' which means guessing.
Usage notesUse 'requirement' in professional and educational contexts. Avoid using it in casual conversation unless necessary.Use 'specification' in formal contexts like contracts or technical documents. Avoid in casual conversations. It's more appropriate for discussions focused on details.

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Requirement

Frequently asked questions: Requirement vs Specification

What's the difference between Requirement and Specification?

Requirement: Something you need or must have. Specification: A detailed description of something's features or requirements.

Which is more common: Requirement and Specification?

Requirement is the most common in everyday English.

Which is more advanced: Requirement and Specification?

Specification is the highest level, at C1, on the CEFR scale.

Are Requirement and Specification the same CEFR level?

Requirement: B2, Specification: C1 on the CEFR scale.

What part of speech are Requirement and Specification?

Requirement: noun, Specification: noun.

Can you show an example of each?

Requirement: The job listing stated that a degree in engineering is a requirement for applicants. Specification: the technical specifications of the new model *(= of car)*

Can I use Requirement and Specification interchangeably?

Not always. Requirement and Specification are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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