Transportation Mean aerodynamic chord, a measure of the geometry of an airfoil Merchant aircraft carrier, used during World War II by Britain and the Netherlands Mid-air collision, a type of aircraft accident Weapons Mac-10 (Military Armament Corporation Model 10, officially the M10), a compact, blowback-operated machine pistol Mac-11, a sub-compact version of the Model 10 machine pistol Other uses in science and technology Mission assurance, an engineering process MAC (Money Access Card), an ATM (automated teller machine) card Other uses MAC Award, or Hermann Trophy, the highest award in American college soccer Mackintosh, a raincoat made of rubberized cloth Modern Army Combatives, a hand-to-hand combat training regimen Material adequacy condition, a concept in the philosophies of logic and language See also Big Mac (disambiguation) Little Mac (disambiguation) McIntosh (disambiguation) Macintosh (disambiguation) Macaroni Macaroni and cheese, or "mac and cheese" in American and Canadian English Mach (disambiguation) Mack (disambiguation) Mak (disambiguation)