Lapping 3 : Smoothing and truing a surface by rubbing it on a flat surface covered lightly with grinding paste, or by rubbing two mating parts together with grinding paste to fit them to each other
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}