specification Definition

1a. A detailed description of the type of methods, materials, dimensions, quantities, etc that are used in the construction, manufacture, building, planning, etc of something;

Thesaurus: term, condition, requirement, stipulation.
Form: specifications (often)
1b. The standard, quality, etc of the construction, manufacture, etc of something.

Example: Saabs are built to high safety specifications
2. An act or instance or the process of specifying.
3. A document that details the particulars and projected use of an invention and which the person wanting to patent it draws up before submitting it to the proper authorities.