for·ty-five (fôr?t?-f?v?)n.1. A .45-caliber pistol.2. A phonograph record designed to be played at 45 revolutions per minute.for?ty-five? adj. & pron.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.forty-five n 1. (Music, other) a gramophone record played at 45 revolutions per minute 2. (Firearms, Gunnery, Ordnance & Artillery) US and Canadian a pistol having .45 calibre Forty-Five n (Historical Terms) the Forty-Five history Brit another name for Jacobite Rebellion2 Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014for?ty-five? n. 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. 4. a.45-caliber handgun or its cartridge (often written as.45). 5. a 7-inch phonograph record played at 45 r.p.m. (often written as 45). Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.