treble (Verb) — Sing treble.
treble (Verb) — Increase threefold.
treble (Adjective) — Having or denoting a high range. ex. "the boy still had a fine treble voice" ex. "the treble clef"
treble (Adjective) — Three times as great or many. ex. "a claim for treble damages"
treble (Adjective) — Having three units, components or elements. ex. "a treble row of red beads"
treble (Adjective) — Having more than one decidedly dissimilar aspects or qualities. ex. "a treble role for an actor" ex. "every episode has its double and treble meaning"
treble (Noun) — The pitch range of the highest female voice.