specification

noun

• 1an act of identifying something precisely or of stating a precise requirement:give a full specification of the job advertised [mass noun]:there was no clear specification of objectives

• 2 (usually specifications) a detailed description of the design and materials used to make something: one of the telescope’s mirrors had been manufactured to incorrect specifications
• a standard of workmanship or materials required to be met in a piece of work:everything was built to a higher specification
• a description of an invention accompanying an application for a patent.