45


noun, plural 45s, 45's.

a seven-inch phonograph record played at 45 r.p.m., especially a popular-music single.

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Origin of 45

First recorded in 1945–50

Definition for 45 (2 of 2)

.45

noun, plural .45s, .45's.

a pistol, revolver, or cartridge of .45-caliber, or having a diameter of  .45 inch.
Also forty-five .
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020