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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.
Tenor is higher pitched than the baritone. An analogy might be a trumpet versus a trombone. The clarion nature of the trumpet may well account for the fact that the most famous singers in opera are tenors - Carusso, Bjerling, Domingo and Pavorotti, for example.