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1. a cardinal number, 40 plus 5.
2. a symbol for this number, as 45 or XLV.
3. a set of this many persons or things.
amounting to 45 in number.
—pl. 45s, 45's.
a seven-inch phonograph record played at 45 r.p.m., esp. a popular-music single.
—pl. .45s, .45's.
a pistol, revolver, or cartridge of .45-caliber, or having a diameter of .45 inch. Also,forty-five.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.