(noun) the highest female voice; the voice of a boy before puberty.
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Noun Definition 2
(noun) the pitch range of the highest female voice. Synonyms: treble.
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Noun Definition 3
(adj) having or denoting a high range. Synonyms: treble. Examples: "Soprano voice." "Soprano sax." "The boy still had a fine treble voice." "The treble clef."