Gratuity

1. (n.) Something given freely or without recompense; a tip; a free gift; a present.

2. (n.) Something voluntarily given in return for a favor or service, as a recompense or acknowledgment.

Thesaurus Entries

Trinkgeld, balance, bonus, boodle, bounty, bribe, bribe money, complimentariness, consideration, costlessness, dividend, donative, double time, expenselessness, extra, fee, free ride, freebie, freeness, gift, gratification, gratuitousness, gravy, grease, honorarium, hush money, incentive pay, inducement, labor of love, lagniappe, largess, leftover, liberality, margin, no charge, overage, overmeasure, overplus, overrun, overset, overstock, oversupply, palm, palm oil, payoff, payola, perks, perquisite, plus, pourboire, premium, protection, remainder, reward, salve, something extra, sop, spare, sportula, surplus, surplusage, sweetener, tip