Biology and medicine •
MAC (chemotherapy), a chemotherapy regimen of Mitoxantrone and Ara-C • Maximum allowable concentration, a concept related to
threshold limit value (TLV) •
Membrane attack complex, an immune system function using complement •
Microbiota-accessible carbohydrates, a category of carbohydrates consumed by gut microbes •
Minimum alveolar concentration, a measure used to compare the strengths of anesthetic vapors •
Mitochondrial apoptosis-induced channel, the cytochrome c release pore of apoptotic mitochondria • Monitored anesthesia care, a form of
anesthesia with partial awareness •
Mycobacterium avium complex, a group of environmental pathogens
Computing and telecommunication •
Mac (computer), a brand of computers and computer operating systems made by Apple Inc. •
macOS, formerly Mac OS X and OS X, Apple's current operating system for Mac computers •
Classic Mac OS, the original operating system for Apple's Macintosh •
.Mac, now iCloud, a subscription service by Apple •
MAC times, metadata containing event times associated with a computer file •
Mandatory access control, a type of access control in computer security •
Maximum activate count, a parameter associated with the LPDDR4 memory's TRR feature •
Medium access control or media access control, a sublayer of the Data Link layer •
MAC address, a unique identifier assigned to a network interface controller •
Message authentication code, used to authenticate a message in cryptography •
Migration Authorisation Code, used when switching Internet service providers in the UK •
Multiplexed Analogue Components, a proposed satellite television transmission standard •
Multiply–accumulate operation (MAC), or multiplier–accumulator, in digital signal processing • .mac, a file extension for macros in
Agilent ChemStation software
Other science and technology •
Mean aerodynamic chord, a measure of the geometry of an airfoil ==Sports==