• (paper) A size of paper (7.5"-10" x 10"-12.5")(190-254 x 254-312 mm). Formed by folding and cutting one of several standard sizes of paper (15"-20" x 20"-25")(381-508 x 508-635 mm) twice to form 4 leaves (eight sides).
  • (printing) A book size, corresponding to the paper size.
  • (Britain) Quarto writing paper (10 inches x 8 inches)

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