a gift of money, over and above payment due for service, as to a waiter or bellhop; tip.

something given without claim or demand.

British .

a bonus granted to war veterans by the government.

a bonus given military personnel on discharge or retirement.

noun

alms , benefaction , bonus , boon , bounty , contribution , donation , fringe benefit , grease palm , largesse , little something , offering , perk * , perquisite , present , recompense , reward , salve * , sweetener , token , cumshaw , largess , tip , benefice , beneficence , benevolence , douceur , honorarium , lagniappe , pourboire