(a.) Designating, or pertaining to, a motion or device in which the movement derived from a driver, or the grip or hold of a restraining piece, is communicated through an unyielding intermediate piece or pieces; as, a claw clutch is a positive clutch, while a friction clutch is not.
POSITIVE
Meaning of POSITIVE in English
Webster's English dictionary. Английский словарь Webster. 2012