Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

Source : WordNet®

biased
     adj 1: favoring one person or side over another; "a biased account
            of the trial"; "a decision that was partial to the
            defendant" [syn: {colored}, {coloured}, {one-sided}, {slanted}]
     2: excessively devoted to one faction [syn: {one-sided}]