Source : Webster's Revised Unabridged Dictionary (1913)

Amateur \Am`a*teur"\, n. [F., fr. L. amator lover, fr. amare to
   love.]
   A person attached to a particular pursuit, study, or science
   as to music or painting; esp. one who cultivates any study or
   art, from taste or attachment, without pursuing it
   professionally.

Source : WordNet®

amateur
     adj 1: engaged in as a pastime; "an amateur painter"; "gained
            valuable experience in amateur theatricals";
            "recreational golfers"; "reading matter that is both
            recreational and mentally stimulating"; "unpaid extras
            in the documentary" [syn: {recreational}, {unpaid}]
     2: lacking professional skill or expertise; "a very amateurish
        job"; "inexpert but conscientious efforts"; "an unskilled
        painting" [syn: {amateurish}, {inexpert}, {unskilled}]

amateur
     n 1: someone who pursues a study or sport as a pastime
     2: does not play for pay [ant: {professional}]