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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.
The tenor voice is, like all voices, a fragile instrument, and opera singers are asked to do a lot of heavy lifting with those two little vocal cords. Below is a sample of a few kinds of tenors, based on the size and timbre of the voice â from the agile and light to the large and dark.