Usually, specifications.a detailed description or assessment of requirements, dimensions, materials, etc., as of a proposed building, machine, bridge, etc.
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.
Origin: 1605–15; < Medieval Latinspecificātiōn- (stem of specificātiō), equivalent to specificāt(us) (past participle of specificāre to mention, describe; see specific, -ate1) + -iōn--ion
(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
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