mac

noun3

1. •
   (slang, offensive) A person of Scottish descent (used in driving culture to denigrate someone for poor/slow/amateurish driving responses).
2. •
   Clipping of mackintosh (“a raincoat”).

   • Standing in the dock at Southampton / Trying to get to Holland or France / The man in the mac said / You've got to go back / You know they didn't even give us a chance — 1969
3. •
   (US, Canada) Clipping of macaroni.

   • Is there any mac and cheese left?

noun14

1. •
   Initialism of media access control: the 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.
2. •
   Initialism of message authentication code.
3. •
   Initialism of mandatory access control.
4. •
   Initialism of Mycobacterium avium complex.
5. •
   Initialism of minimum alveolar concentration.
6. •
   Initialism of 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 the same cycle, used extensively in implementations of digital filters, transforms, and codecs.
7. •
   Initialism of mid-air collision.
8. •
   Initialism of monitored anesthesia care.
9. •
   Initialism of mean aerodynamic chord.
10. •
    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.
11. •
    Initialism of membrane attack complex, a part of the complement system of the innate immune system.
12. •
    (UK) Initialism of Migration Authorisation Code.
13. •
    (historical) Initialism of merchant aircraft carrier.
14. •
    Initialism of magnetic accelerator cannon.

noun2

1. •
   a computer made by the American company Apple

   • Although our Macs served us well, in those early, dark years Macintosh users were effectively excommunicated by the computer establishment. — 1987
2. •
   (US, informal) Used to address a man whose name is unknown.

   • Have you got a light, Mac?