Editing AC (section)

== 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&nbsp;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)]]