Other definitions of 45:

• A 45 lb (20kg) standard weight plate used on Olympic barbells. Often referred to as a "1 plate" or "a plate" I hit a new personal best on deadlift yesterday repping three 45's. That's 160kg, not counting the bar!
• Short for "colt 45" The term colt 45 originated with the creation of the colt 45 pistol. It later became the title of an American Western film directed by Edwin L. Marin, Starring Randolph Scott. It was also the title of an American Western TV series which aired on ABC between October 1957 and September 1960

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