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definition?

(From Dictionary.com)

-noun
1. the act of defining or making definite, distinct, or clear.
2. the formal statement of the meaning or significance of a word, phrase, etc.
3. the condition of being definite, distinct, or clearly outlined.
4. Optics. sharpness of the image formed by an optical system.
5. Radio and Television. the accuracy of sound or picture reproduction.