Definitions of treble:

• noun:   the pitch range of the highest female voice
• verb:   sing treble
• verb:   increase threefold
• adjective:   three times as great or many

  Example: "A claim for treble (or triple) damages"

• adjective:   having or denoting a high range

  Example: "The boy still had a fine treble voice"

• adjective:   having three units or components or elements

  Example: "A treble row of red beads"

• adjective:   having more than one decidedly dissimilar aspects or qualities

  Example: "Every episode has its double and treble meaning-Frederick Harrison"