osaline määrimine, kus kahe hõõrduva pinna vahel puudub vedelmäärdekiht; pindadel eksisteerib ainult määrde monomolekulaarne kiht (vt hõõrdumine), a state of partial lubrication which may exist between two surfaces in the absence of fluid oil film due to the existence of absorbed monomolecular layer of lubricant on the surfaces (see: friction)