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British Informal. a mackintosh: »
The raincoat, or mac, is as essential to an Englishman as his teeth (H. Allen Smith).
1. son of (used in Scottish and Irish family names): »Her Macs let Scotland boast (Henry Fielding).
2. U.S. Slang. fellow (used as a form of direct address): »“If you don't like the way the subway's being run, Mac, why don't you buy it?” (New Yorker).
╂[< Mac-]1. Military Airlift Command (a unit of the U.S. Air Force).2. multiple-access computer (a computer system which allows simultaneous use from several inputs).Mac-,prefix.son of (used in Scottish and Irish family names). Also, Mc-.╂[< Scottish Gaelic, and Irish mac son]Mac.,Maccabees (books of the Apocrypha).
Useful english dictionary. 2012.