Pronunciation Noun

mac (plural macs)

  1. Clipping of mackintosh#English|mackintosh (“a raincoat”).

mac (uncountable)

  1. (North America, slang) Clipping of macaroni#English|macaroni.
    Is there any mac and cheese left?


mac (plural macs)

  1. (US, informal) Used to address a man whose name is unknown.
    Have you got a light, Mac?
Synonyms Prefix
  1. (Irish and Scottish patronymic surnames) son of.
Proper noun
  1. A diminutive of the male given name Max.

mac (plural macs)

  1. A Macintosh computer (made by Apple Inc.), or its operating system.
    • 1991, “Breaking Communications Barriers”, in Compute!, v 13, n 9, pp 28–31:
      Built by Matthew Weed, a blind political science and history major, and Victor Grigorieff, a computer science and psychology major, the system is based on a Macintosh IIfx, although it can run on earlier models, since each Mac program has a similar interface.
    • 1993, “The New Microprocessors Powerchips” in Popular Science, v 243, n 1, p 58:
      Apple, IBM, and Motorola have teamed up to produce this 32-bit chip that will be used in future Apple Macintoshes and IBM PCs. PowerPC systems will run Mac or Unix programs, and possibly Windows software in the future.
    • 1993, “The Newest Appliance” in U.S. News & World Report, v 115, n 21, p 90:
      If you invest the time to learn one Windows or Mac program, you'll automatically have mastered the basic skills to use hundreds of others.
    • 2007, “Uninspiring Vista”, in Technology Review, v 110, n 1, pp 72–4:
      As this shift accelerates, finding software that works with a particular operating system will be less of a concern. People will be able to base decisions about which OS to use strictly on merit, and on personal preference. For me, if the choice is between struggling to configure every feature and being able to boot up and get to work, at long last I choose the Mac.
    • 2008, Glenn Derene, “Mac VS. PC”, in Popular Mechanics, volume 185, number 5, page 86:
      Oddly, the big difference didn't come in our user ratings, where we expected the famously friendly Mac interface to shine.
      Apple's popular commercials have painted the picture in stark terms: There are two types of people, Mac people and PC people.
Proper noun
  1. (informal) McMaster University

Proper noun
  1. (US military) Acronym of Military Airlift Command formerly, one of three former divisions of the US airforce, the others being SAC and TAC.
  2. (computing) Multiply And Accumulate, a hardware module found in Digital Signal Processors which performs a multiplication and adds the result of that operation to an accumulator, in a single cycle. Used extensively in implementations of digital filters, transforms and codecs.
  1. (chemistry) 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.
  2. (computer security) Initialism of mandatory access control}.
  3. (networking) Initialism of media access control: that portion of Ethernet, Wi-Fi 802.11 wireless, Bluetooth, FDDI, ATM, and Fibre Channel networks that controls which hardware devices have access to the media over which signals are sent.
  4. (mechanics) Initialism of mean aerodynamic chord.
  5. (cryptography) Initialism of message authentication code.
  6. (science fiction) Initialism of magnetic accelerator cannon.
  7. (UK, telecommunications) Initialism of Migration Authorisation Code}.
  8. (immunology) Initialism of membrane attack complex#English|membrane attack complex, a part of the complement system of the innate immune system.

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