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From our dictionary:
fal•set•toPronunciation: (fôl-set'O), [key] —n., pl. -tos,—adj., adv. —n. 1. an unnaturally or artificially high-pitched voice or register, esp. in a man. 2. a person, esp. a man, who sings with such a voice. —adj. of, noting, or having the quality and compass of such a voice. —adv. in a falsetto.
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