What does the word triplet mean?

Usage examples for triplet

  1. " Madam," said Triplet, at the door. – Peg Woffington by Charles Reade
  2. " You may, madam," said Triplet, gravely. – Peg Woffington by Charles Reade
  3. The altar- window of the original building remained, only transformed into a kind of triplet, the central compartment rising above the other two, and made circular headed. – Toronto of Old by Henry Scadding
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