imperfect: Meaning and Definition of

im•per•fect

1. of, pertaining to, or characterized by defects or weaknesses: imperfect vision.
2. not perfect; lacking completeness: imperfect knowledge.
3. noting action or state still in process at some temporal point of reference, particularly in the past.
4. being without legal effect or support; unenforceable.
5. (of a flower) diclinous.
6. of or relating to the interval of a major or minor third or sixth. Cf. perfect (def. 12a).