Active pharmaceutical ingredient (API) manufacturers have identified the need for standards for the design of equipment that is more efficiently cleanable to enhance acceptance by QA and inspection agencies and advance the state-of-the-art for production equipment. The new Pharmaceutical 3-A (P3-A) standards provide the requirements for materials of construction and for the design of cleanable equipment for the manufacture of active pharmaceutical ingredients.This standard provides users of Pharmaceutical 3-A® (P3-A) Standards and Accepted Practices with definitions of acronyms and terms widely used in these documents.