AC, A.C. or Ac may refer to:
Aciclovir (ACV), also known as acyclovir, is an antiviral medication. It is primarily used for the treatment of herpes simplex virus infections, chickenpox, and shingles.
Plugs and sockets for electrical appliances not hardwired to mains electricity originated in Britain in the 1880s and were initially two-pin designs.
An actor (or actress for females; see terminology) is a person who portrays a character in a performance.
An acid dissociation constant, Ka, (also known as acidity constant, or acid-ionization constant) is a quantitative measure of the strength of an acid in solution.
The Achaemenid Empire (/əˈkiːmənɪd/, from Old Persian Haxāmanišiya, c. 550–330 BC), also called the (First) Persian Empire, was an empire based in Western Asia, founded by Cyrus the Great.
Acupuncture is a form of alternative medicine in which thin needles are inserted into the body. It is a key component of traditional Chinese medicine (TCM).
An acronym is a word or name formed as an abbreviation from the initial components in a phrase or a word, usually individual letters (as in NATO or laser) and sometimes syllables (as in Benelux).
Academi is an American private military company that was founded in 1997 by former Navy SEAL officer Erik Prince as Blackwater.
Acetylcholine is an organic chemical that functions in the brain and body of many types of animals, including humans, as a neurotransmitter—a chemical released by nerve cells to send signals to other cells.