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.

---

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

---

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

F1 rules dictate that manufacturers must supply engines of exactly the same specification to all their teams - works or customer.

From BBC • Mar. 10, 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

The very earliest events in the specification of an embryo—the specification of the body axis, of front and back, and left versus right—were among the last to be understood.

From "The Gene" by Siddhartha Mukherjee

Related Words

• blueprint
• spec
• stipulation