noun

1. a defining or being defined
2. a statement of what a thing is
3. a statement of the meaning as of a word or phrase
4. 1. a putting or being in clear, sharp outline
   2. a making or being definite, explicit, and clear
5. the power of a lens to show (an object) in clear, sharp outline
6. the degree of distinctness of a photograph, etc.
7. the clearness with which recorded or broadcast sounds or televised images are reproduced; absence of fuzziness

Etymology: ME diffinicioun < OFr definicion & ML diffinitio, both < L definitio