specification

American  

[spes-uh-fi-key-shuhn] / ˌspɛs ə fɪˈkeɪ ʃən /

noun

1. the act of specifying.

2. Usually specifications.

   1. a detailed description or assessment of requirements, dimensions, materials, etc., as of a proposed building, machine, bridge, etc.

   2. Computers. a detailed description of the hardware installed, including the memory capacity, processor speed, and graphics card model.

3. a particular item, aspect, calculation, etc., in such a description.

4. something specified, as in a bill of particulars; a specified particular, item, or article.

   Synonyms:

   qualification, condition, requirement

5. an act of making specific.

6. the state of having a specific character.

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specification British  

/ ˌspɛsɪfɪˈkeɪʃən /

noun

1. the act or an instance of specifying

2. (in patent law) a written statement accompanying an application for a patent that describes the nature of an invention

3. a detailed description of the criteria for the constituents, construction, appearance, performance, etc, of a material, apparatus, etc, or of the standard of workmanship required in its manufacture

4. an item, detail, etc, specified

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Other Word Forms

• nonspecification noun
• prespecification noun
• respecification noun
• superspecification noun

Etymology

Origin of specification

First recorded in 1605–15; from Medieval Latin specificātiōn- (stem of specificātiō ), equivalent to specificāt(us) (past participle of specificāre “to mention, describe”; specific, -ate ¹ ) + -iōn- -ion

Example Sentences

The Black Badge specification features a dark-anodized grille and hood figurine in the place of chrome brightwork—younger, fresher, more nocturnal, but also nicely understated, which I like.

From The Wall Street Journal • Apr. 4, 2026

Headline lap times in testing are notoriously unreliable as indicators of form as the specification in which the cars are running is not made public.

From BBC • Feb. 11, 2026

The job specification describes the role as one of "the most important, high-profile public posts in the UK".

From Barron's • Nov. 24, 2025

My specification is that it can’t be about superheroes.

From Los Angeles Times • Jul. 25, 2025

Having absorbed Lawrence’s confidence that further efficiencies eventually would be achieved, Groves reduced the specification for Y-12 to five hundred tanks, or five racetracks.

From "Big Science" by Michael Hiltzik

Related Words

• blueprint
• spec
• stipulation