Definition(s)
API Product Specification
Prescribed set of rules, conditions, or requirements concerned with the definition of terms; classification of components; delineation of procedures; specification of dimensions; construction criteria; materials, performance, design, or operations; measurement of quality and quantity in describing materials; products, systems, services, or practices; or descriptions of fit and measurement of size.
Source: API SPEC Q1, Specification for Quality Programs for the Petroleum, Petrochemical and Natural Gas Industry, Upstream Segment, Eighth Edition, December 2007 (Addendum December 2010). Global Standards