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Meaning of letter-size

let•ter-size

Pronunciation: (let'ur-sīz"), [key]
— adj.
  1. (of paper) measuring approximately 8 × 11 in. (22 × 28 cm).
  2. (of office supplies and equipment) made for holding letter-size sheets of paper. Cf. legal-size.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.