an incidental benefit gained from a certain type of employment, such as the use of a company car
2.
a customary benefit received in addition to a regular income
3.
a customary tip
4.
something expected or regarded as an exclusive right
Often (informal) shortened to: perk
Word origin
C15: from Medieval Latin perquīsītum an acquired possession, from Latin perquīrere to seek earnestly for something, from per- (thoroughly) + quaerere to ask for, seek