Source : Webster's Revised Unabridged Dictionary (1913)

Liberalize \Lib"er*al*ize\ (l[i^]b"[~e]r*al*[imac]z), v. t.
   [imp. & p. p. {Liberalized} (-[imac]zd); p. pr. & vb. n.
   {Liberalizing} (-[imac]`z[i^]ng).] [Cf. F. lib['e]raliser.]
   To make liberal; to free from narrow views or prejudices.

         To open and to liberalize the mind.      --Burke.

Source : WordNet®

liberalize
     v 1: make liberal or more liberal, of laws and rules [syn: {liberalise}]
     2: become more liberal; "The laws liberalized after
        Prohibition" [syn: {liberalise}]