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From The Collaborative International Dictionary of English v.0.48:
Warn \Warn\, v. t. [imp. & p. p. Warned; p. pr. & vb. n. Warning.] [OE. warnen, warnien, AS. warnian, wearnian, to take heed, to warn; akin to AS. wearn denial, refusal, OS. warning, wernian, to refuse, OHG. warnen, G. warnen to warn, OFries. warna, werna, Icel. varna to refuse; and probably to E. wary. ????.] [1913 Webster] 1. To make ware or aware; to give previous information to; to give notice to; to notify; to admonish; hence, to notify or summon by authority; as, to warn a town meeting; to warn a tenant to quit a house. "Warned of the ensuing fight." --Dryden. [1913 Webster] Cornelius the centurion . . . was warned from God by an holy angel to send for thee. --Acts x. 22. [1913 Webster] Who is it that hath warned us to the walls? --Shak. [1913 Webster] 2. To give notice to, of approaching or probable danger or evil; to caution against anything that may prove injurious. "Juturna warns the Daunian chief of Lausus' danger, urging swift relief." --Dryden. [1913 Webster] 3. To ward off. [Obs.] --Spenser. [1913 Webster]