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From The Collaborative International Dictionary of English v.0.48:
Overflow \O"ver*flow`\, n. 1. A flowing over, as of water or other fluid; an inundation. --Bacon. [1913 Webster] 2. That which flows over; a superfluous portion; a superabundance. --Shak. [1913 Webster] 3. An outlet for the escape of surplus liquid. [1913 Webster] Overflow meeting, a meeting constituted of the surplus or overflow of another audience. [1913 Webster]