ETYM French gratuité, or Late Lat. gratuitas.
1. A relatively small amount of money given for services rendered (as by a waiter); SYN. tip, baksheesh, bakshish, bakshis, backsheesh.
2. An award (as for meritorious service) given without claim or obligation.
Prime.
Caractère de ce qui est gratuit ou arbitraire.
Gratification.