letter-size
[let-er-sahyz]
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adjective
(of paper) measuring approximately 8½ × 11 inches (22 × 28 cm).
(of office supplies and equipment) made for holding letter-size sheets of paper.
Compare legal-size.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for letter-size
Historical Examples of letter-size
The circulars are printed on half a sheet of letter-size typewriting paper, sold in several stationery store in large quantities.
Mary Louise and the Liberty GirlsEdith Van Dyne (AKA L. Frank Baum)