the act of specifying.
Usually, specifications. a detailed description or assessment of requirements, dimensions, materials, etc., as of a proposed building, machine, bridge, etc.
a particular item, aspect, calculation, etc., in such a description.
something specified, as in a bill of particulars; a specified particular, item, or article.
an act of making specific.
the state of having a specific character.

1605–15; < Medieval Latin specificātiōn- (stem of specificātiō), equivalent to specificāt(us) (past participle of specificāre to mention, describe; see specific, -ate1) + -iōn- -ion

nonspecification, noun
prespecification, noun
respecification, noun
superspecification, noun

4. requirement, condition, qualification.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
specification (ˌspɛsɪfɪˈkeɪʃən)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1615, "act of investing with some quality," from M.L. specificationem (nom. specificatio), from L. species "kind, sort" (see species) + -ficus, unstressed comb. form of facere "to make, do." Meaning "technical particular" is attested from 1833; short form spec first attested 1956
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Father's specifications for his egg were relentlessly precise.
The meat is always fresh, excellent quality, and the butcher prepares it to our
Various all-digital campuses could collaborate to develop specifications for
  such helpful software as well as open-source tools.
Ability to discern user requirements and develop specifications.
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