Vail \Vail\, n. [Aphetic form of avail, n.] [1913 Webster] 1. Avails; profit; return; proceeds. [Obs.] [1913 Webster] My house is as were the cave where the young outlaw hoards the stolen vails of his occupation. --Chapman. [1913 Webster] 2. An unexpected gain or acquisition; a casual advantage or benefit; a windfall. [Obs.] [1913 Webster] 3. Money given to servants by visitors; a gratuity; -- usually in the plural. [Written also {vale}.] --Dryden. [1913 Webster]