cleanliness verification

This term is defined in ECSS-E-ST-35-06C Rev.1 as
activity intended to verify that the actual cleanliness conditions of an item are in conformance with the applicable specification

This term is defined in ECSS-Q-ST-70-01C as
activity intended to verify that the actual cleanliness conditions of the space system, the cleanrooms or the vacuum chambers are in conformance with the applicable specifications and other cleanliness requirements

This term is defined in ECSS-Q-ST-70-50C as
activity intended to verify that the actual cleanliness conditions of the spacecraft system, the cleanrooms, and other environments in which the spacecraft system will reside, are in conformance with the applicable specifications and other cleanliness requirements