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== Science and technology == === Biology and medicine === * [[Acromioclavicular joint]] (''AC joint''), the shoulder junction between the scapula and the clavicle * [[Adenylate cyclase]], a lyase enzyme * [[Adriamycin]] and [[cyclophosphamide]], a chemotherapy regimen used to treat breast cancer * Ante cibum (''ac''), Latin for "before meal", commonly seen in [[medical prescription]]s * [[Anterior commissure]], a bundle of nerve fibers connecting the two temporal lobes of the brain * [[Anterior cruciate ligament]] (''AC ligament'' or ''ACL''), a major ligament in the knee * [[Appropriateness criteria]], when it is appropriate to perform a medical procedure or service * [[Assist control]], a former term for continuous mandatory ventilation, a mode of mechanical ventilation *[[Adenocarcinoma]], a type of cancerous tumor *[[Allergic conjunctivitis]], inflammation of the conjunctiva ===Chemistry=== * [[Acetyl]], a functional group in chemistry * [[Actinium]], symbol Ac, a chemical element * [[Hydrogen cyanide]], also called as AC in [[chemical weapon]] term ===Computing and telecommunications=== * [[.ac]], Internet top-level domain name for Ascension Island * [[.ac (second-level domain)]], Internet second-level domain used to denote academic institutions in many countries * [[AC (complexity)]], a hierarchy of complexity classes found in circuit complexity * AC, initialism of [[access control]] * [[Artificial consciousness]], a field related to artificial intelligence and cognitive robotics * [[Authorization certificate]] or attribute certificate, a digital permission to use a service or resource * [[Arithmetic coding]], a form of entropy encoding used in lossless data compression * alternating component a.k.a. AC coefficient in [[JPEG#Discrete cosine transform|discrete cosine transform]] * [[IEEE 802.11ac]], a wifi standard using 5 GHz, released in Dec 2013 ===Meteorology=== * [[Altocumulus]], a medium level cloud type * [[Anticipated convection]], convective outlooks issued by the U.S. National Weather Service ===Other uses in science and technology=== * [[Air conditioning]], technologies for altering the temperature and humidity of air * Across corners (A/C), a measure of [[Nut (hardware)#Standard metric hex nuts sizes|external diameter of hexagonal nuts]] * [[Alternating current]], a type of electric current ** [[AC power]], a net transfer of energy over a complete cycle of the alternating current waveform * [[Asphalt concrete]], a type of road or path surfacing * [[Average cost]], in economics * [[Axiom of choice]], a mathematical concept in set theory * A US Navy hull classification symbol: [[List of auxiliaries of the United States Navy#Colliers (AC)|Collier (AC)]]
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