As a Noun: 1. A movement of the hand up and down, or a closing and opening of the hand at the knuckles, as a gesture of greeting or leave-taking. English = wave. As a Verb or Adjective: 1. To move your hand in acknowledgment of someone when you meet them, or as a parting gesture when they (or you) are leaving. English = wave. Interactive: 1. Used alone as an acknowledgment when meeting someone or, more often, when leaving. English = 'Good bye', 'Bye.' Formal English = 'Farewell'.