emolument (n.)

mid-15c., "the profit arising from office or employment, that which is given as compensation for services," from Old French émolument "advantage, gain, benefit; income, revenue" (13c.) and directly from Latin emolumentum "profit, gain, advantage, benefit," perhaps originally "payment to a miller for grinding corn," from emolere "grind out," from assimilated form of ex "out" (see ex-) + molere "to grind" (from PIE root *mele- "to crush, grind"). Formerly also "profit, advantage, gain in general, that which promotes the good of any person or thing" (1630s).