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From The Collaborative International Dictionary of English v.0.48:
Warning \Warn"ing\, a. Giving previous notice; cautioning; admonishing; as, a warning voice. [1913 Webster] That warning timepiece never ceased. --Longfellow. [1913 Webster] Warning piece, Warning wheel (Horol.), a piece or wheel which produces a sound shortly before the clock strikes. [1913 Webster]