Dictionary

MAC en · NOUN

Meanings

1. (abbreviation, alt-of, countable, initialism, uncountable) 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.
   alt of maximum allowable concentration
2. (abbreviation, alt-of, countable, initialism, qualifier:computer security, uncountable) Initialism of mandatory access control.
   alt of mandatory access control
3. (abbreviation, alt-of, countable, initialism, uncountable) 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.
   alt of media access control
   • When operating on customer MAC (C-MAC) and service MAC (S-MAC) addresses, PBB uses a new backbone MAC (B-MAC) address. The B-MAC address is added at the edge of the PBB network, that is administered by a carrier VPN or a carrier-of-carriers VPN. 2025 April 17, “Provider Backbone Bridging (PBB) and EVPN Integration Overview”, in Juniper Networks, archived from the original on 01 Jul 2025:
4. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of mean aerodynamic chord.
   alt of mean aerodynamic chord
5. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of mid-air collision.
   alt of mid-air collision
6. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of message authentication code.
   alt of message authentication code
7. (abbreviation, alt-of, countable, historical, initialism, uncountable) Initialism of merchant aircraft carrier.
   alt of merchant aircraft carrier
8. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of magnetic accelerator cannon.
   alt of magnetic accelerator cannon
9. (UK, abbreviation, alt-of, countable, initialism, uncountable) Initialism of Migration Authorisation Code.
   alt of Migration Authorisation Code
10. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of membrane attack complex, a part of the complement system of the innate immune system.
    alt of membrane attack complex
11. (abbreviation, alt-of, countable, initialism, uncountable) 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.
    alt of multiply and accumulate
12. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of Mycobacterium avium complex.
    alt of Mycobacterium avium complex
13. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of minimum alveolar concentration.
    alt of minimum alveolar concentration
14. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of monitored anesthesia care.
    alt of monitored anesthesia care

Forms

Deriveds

MAC address

Hyponyms

HMAC

MAC en · PROPN

Meanings

1. (US, abbreviation, acronym, alt-of) Acronym of Military Airlift Command, formerly, one of three former divisions of the US airforce, the others being SAC and TAC.
   alt of formerly
   alt of Military Airlift Command
   alt of one of three former divisions of the US airforce
2. (abbreviation, acronym, alt-of) Acronym of Military Armament Corporation.
   alt of Military Armament Corporation
3. (abbreviation, alt-of, initialism, qualifier:UN) Initialism of Military Armistice Commission.
   alt of Military Armistice Commission