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Definition of tenor for English Language Learners. : the highest adult male singing voice; also : a singer who has such a voice.
a. the male voice intermediate between alto and baritone, having a range approximately from the B a ninth below middle C to the G a fifth above it. b. a singer with such a voice. c. a saxophone, horn, recorder, etc, intermediate in compass and size between the alto and baritone or bass. d. (as modifier): a tenor sax.