The "false" (singing) voice in any human, usually airy and lacking a purity of vowels; created by utilizing the next highest vocal folds above those used for speech and normal range singing. It is commonly confused with the Head Voice register
a male singing voice with artificially high tones in an upper register artificially high; above the normal voice range; "a falsetto voice
A false or artificial voice; that voice in a man which lies above his natural voice; the male counter tenor or alto voice
{s} (Music) of or pertaining to a falsetto; pertaining to an unnaturally high-pitched voice (esp. in a man); pertaining to one who sings with an unnaturally high-pitched voice (esp. of a man)
If a man sings or speaks in a falsetto, his voice is high-pitched, and higher than a man's normal voice. He sang to himself in a soft falsetto. a falsetto voice. falsettos a very high male voice
The thin, upper range of the voice where only the extreme outer edges of the vocal folds vibrate