noun (n)

• a relatively small amount of money given for services rendered (as by a waiter)(noun.possession)

  Synonym:
  backsheesh, baksheesh, bakshis, bakshish, pourboire, tip
  

  source: wordnet30
• an award (as for meritorious service) given without claim or obligation(noun.possession)

  source: wordnet30
• Something given freely or without recompense; a free gift; a present.(noun)

  source: webster1913