Source : Webster's Revised Unabridged Dictionary (1913)

Idealist \I*de"al*ist\, n. [Cf. F. id['e]aliste.]
   1. One who idealizes; one who forms picturesque fancies; one
      given to romantic expectations.

   2. One who holds the doctrine of idealism.

Source : WordNet®

idealist
     n : someone guided more by ideals than by practical
         considerations [syn: {dreamer}]