a waterproof raincoat made of rubberized fabric
"She slipped on her yellow mac before heading out into the sudden downpour."
Clipping of mackintosh (“a raincoat”).
"I left my files on the mac while I was working from home yesterday."
Clipping of macaroni.
Initialism of maximum allowable concentration, the maximum concentration of a pollutant which is considered harmless to healthy adults during their working hours, assuming they breathe uncontaminated air at all other times.
Used to address a man whose name is unknown.
A Macintosh computer (made by Apple Inc.).
In plain English: A Mac is a brand of personal computer made by Apple that is known for being easy to use and having a sleek design.
"He plugged his new mac into the printer to send the document."
Usage: Use "Mac" to refer specifically to a personal computer manufactured by Apple Inc., such as when distinguishing it from a PC. It functions as both a singular noun and an adjective, but never pluralize it as "maces."
Acronym of Military Airlift Command, formerly, one of three former divisions of the US airforce, the others being SAC and TAC.
"She decided to apply to Mac for her undergraduate engineering program because of its strong robotics department."
A diminutive of the male given name Max.
McMaster University
son of.
"In their family tree, every person listed as a 'Mac' is actually the son of someone who carried that same name before them."
Mac is a shortened form of mackintosh, referring to the waterproof raincoat invented by Charles Macintosh. The word entered common usage as people began calling these coats simply "macks" and eventually truncating them further to "macs."