API, originally Advanced Programming Interface but now more commonly known by its near synonym, Application Programming Interface, is any defined inter-program interface.

API or api may also refer to:

• Api , a mountain in Nepal
• API gravity, a measure of the density of petroleum
• Academic Performance Index
• Academic Programs International
• Active pharmaceutical ingredient
• Advance Passenger Information
• Air Pollution Index in Hong Kong
• Alabama Polytechnic Institute
• Alphabet phonétique international or International Phonetic Alphabet
• American Petroleum Institute
• Animal Protection Institute
• Atmospheric pressure ionization
• Australian Property Institute
• Automated Processes Inc
• Aviation Partners Inc.
• Armor-piercing incendiary, a type of armor-piercing shot and shell
• Asian-Pacific Islander, an abbreviation often used in racial demographics

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