AP, Ap, or ap may mean:

• Ap, plural apas the Hindu term for water as a classical element and a diefied personification thereof.
• Ap, the Welsh patronymic, corresponding to Gaelic mac. For example, Dafydd ap Gruffydd

Acronyms:

• Associated Press, an American news agency
• Access Point, (aka Wireless access point) provides multipoint access for wireless broadband connections from SU.
• Accounts payable, an accounting term
• Acetone peroxide, an explosive
• AP or Action Point, a unit of movement that must be expended to perform an action in many war and role-playing games
• Action potential, an electrical event in the neuron
• Advanced Placement Program, a College Board high school program
• Air One IATA code
• Alternative Press, a music magazine.
• Amiga Power, a defunct monthly computer magazine about Amiga computer games
• Andhra Pradesh, a state in south India
• Andean Pact, now the Andean Community, a trade agreement
• Atos Prime, one of the Hyundai Atos cars
• Popular Action ("Acción Popular"), a political party
• AP, the U.S. military state code for personnel in the Pacific Ocean region
• AP, the U.S. Navy hull classification symbol for "transport"
• Assistant principal
• Arithmetic progression, a sequence of numbers, each differing from its predecessor by a fixed quantity
• Armor-piercing shot and shell
• Ap, a nickname for the comic book character Apathy Kat
• A&P grocery store
• Au pair
• Allied Press, a major New Zealand newspaper company

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