What does the word treble mean?

Usage examples for treble

  1. And for a double letter, there shall be charged double the rates above specified; and for a treble letter, treble these rates, and for a quadruple letter, quadruple these rates; and every letter or paper not exceeding half an ounce in weight shall be deemed a single letter; and every additional weight of half an ounce, or every additional weight of less than half an ounce, shall be charged with an additional single postage; and upon all letters passing through or in the mail of the United States, except such as are to or from a foreign country, the postages as above specified, shall be prepaid, except upon letters and papers addressed to officers of the government on official business, which shall be so marked on the envelope. – History of the Postage Stamps of the United States of America by John Kerr Tiffany
  2. " O'gon," Carlyle piped in his baby treble. – The Lost Wagon by James Arthur Kjelgaard