AP is a short initialism encountered in news, education, computing, finance, medicine, military and leisure contexts. Because the two letters are widely useful, AP has several unrelated meanings; understanding which applies depends on the subject area and surrounding words.

Common senses

  • Associated Press — a large international news cooperative often credited in bylines simply as “AP.” It supplies wire copy, photos and other journalism to newspapers, broadcasters and websites.
  • Advanced Placement — a U.S. program of college‑level high school courses and exams administered by the College Board; scores can earn college credit or placement.
  • Access point — in networking, a wireless access point (AP) is hardware that lets Wi‑Fi devices connect to a wired network or to one another.
  • Accounts payable — in accounting, AP denotes short‑term obligations a business owes to suppliers and vendors for goods or services received.
  • Armor‑piercing — a descriptor for ammunition or projectiles designed to penetrate armor; often abbreviated AP on ordnance markings.
  • Arithmetic progression — in mathematics, an AP is a sequence where each term differs from the previous by a constant amount.
  • Anteroposterior (AP) view — in medicine and radiography, an AP projection describes an X‑ray beam travelling from front to back of the body.
  • Action points / application processor — AP can mean action points in games (resource for turns) or refer to an application processor (the main SoC in mobile devices).

Some senses have distinct histories. The Associated Press originated in the 19th century as a cooperative for sharing news; the Advanced Placement program began in the mid‑20th century to bridge secondary and tertiary education. Wireless access points emerged with Wi‑Fi standards in the late 1990s, while the accounting term reflects longstanding bookkeeping practice.

Choosing the correct interpretation is contextual: a byline or news article usually signals the newswire meaning; course descriptions, transcripts, or high school contexts point to Advanced Placement; technical networking texts use access point; invoices and ledgers imply accounts payable. Capitalization, surrounding words and domain‑specific abbreviations help disambiguate.

Notable distinctions include styling (the news organization is commonly written as “AP” in all caps), and plural or adjectival uses (an AP course, AP units). When precision matters, writers often expand the abbreviation on first use: for example, “Associated Press (AP)” or “accounts payable (AP).”