Vibrato definitions

və-brä'tō, vī-
A tremulous or pulsating effect produced in an instrumental or vocal tone by minute and rapid variations in pitch.
noun
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A pulsating effect, less extreme than a tremolo, produced by rapid alternation of a given tone with a barely perceptible variation in pitch, as by the slight oscillation of the finger on a violin string or by a slight wavering of the tone in singing.
noun
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(music) The musical effect or technique where the pitch or frequency of a note or sound is quickly and repeatedly raised and lowered over a small distance for the duration of that note or sound.
noun
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Origin of vibrato

Italian from Late Latin vibrātus a quivering from Latin past participle of vibrāre to vibrate vibrate