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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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Computing Dictionary

specification definition

(spec) A document describing how some system should work.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
And, after all, no market demand in the world takes the form of exact technical
  specification of the article required.
Consult the specification sheet for the solar panels.
Libraries, the cathedrals of learning necessary for any university, are not up
  to specification.
These devices need a slightly different specification from domestic ones,
  adapted to cope with a harsh outdoor environment.
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