amateur

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A person who engages in an art, science, study, or athletic activity as a pastime rather than as a profession.
2. n. Sports An athlete who has never accepted money, or who accepts money under restrictions specified by a regulatory body, for participating in a competition.
3. n. One lacking the skill of a professional, as in an art.
4. adj. Of or performed by an amateur.
5. adj. Made up of amateurs: an amateur cast.
6. adj. Not professional; unskillful.

Century Dictionary and Cyclopedia

1. n. One who admires; an admirer; a lover.
2. n. One who has an especial love for any art, study, or pursuit, but does not practise it.
3. n. Most commonly, one who cultivates any study or art from taste or attachment, without pursuing it professionally or with a view to gain: often used of one who pursues a study or an art in a desultory, unskilful, or non-professional way.
4. n. Specifically, in sporting and athletics, an athlete who has never competed in a match open to all comers, or for a stake, or for public money, or for gate-money, or under a false name, or with a professional for a prize, and has never taught or pursued athletic exercises as a means of support.
5. Pertaining to or having the character of an amateur: as, amateur work; an amateur pianist.

Wiktionary

1. n. A lover of something.
2. n. A person attached to a particular pursuit, study, or science as to music or painting; especially one who cultivates any study or art, from taste or attachment, without pursuing it professionally.
3. n. Someone who is unqualified or insufficiently skillful.
4. adj. Non-professional.
5. adj. Created, done, or populated by amateurs or non-professionals.
6. adj. Showing a lack of professionalism, experience or talent.

GNU Webster's 1913

1. n. 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.

WordNet 3.0

1. n. an athlete who does not play for pay
2. adj. engaged in as a pastime
3. n. someone who pursues a study or sport as a pastime
4. adj. lacking professional skill or expertise