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45

noun, plural 45s, 45's.
1.
a seven-inch phonograph record played at 45 r.p.m., especially a popular-music single.
Origin
1945-1950
1945-50

.45

noun, plural .45s, .45's.
1.
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 Dictionary, © Random House, Inc. 2014.
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