Definitions of triple:

• noun:   a base hit at which the batter stops safely at third base
• noun:   a quantity that is three times as great as another
• verb:   increase threefold

  Example: "Triple your income!"

• verb:   hit a three-base hit
• adjective:   having three units or components or elements

  Example: "Overcrowding made triple sessions necessary"

• adjective:   three times as great or many

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