The Collaborative International Dictionary of English v.0.48:

Bias \Bi"as\, v. t. [imp. & p. p. Biased (b[imac]"ast); p. pr.
   & vb. n. Biasing.]
   To incline to one side; to give a particular direction to; to
   influence; to prejudice; to prepossess.
   [1913 Webster]

         Me it had not biased in the one direction, nor should
         it have biased any just critic in the counter
         direction.                               --De Quincey.
   [1913 Webster]