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API

American

abbreviation

American Petroleum Institute. Also A.P.I.
Computers. application programming (or program) interface: a set of protocols used by programmers to create applications for a specific operating system or to interface between the different modules of an application.

API British

abbreviation

application programming interface

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The lack of security on the platform also allowed humans to post content on Moltbook by using API requests to send messages directly to the site.

From MarketWatch • Mar. 10, 2026

“Where we are legally required to provide AI chatbots through the WhatsApp Business API, we are introducing pricing for the companies who choose to use our platform to provide those services,” a Meta spokesperson said.

From The Wall Street Journal • Mar. 5, 2026

According to Anthropic, the three Chinese labs generated more than 16 million exchanges with Claude through unauthorized third-party API resellers.

From MarketWatch • Feb. 28, 2026

“It takes far too long to build the infrastructure required to move energy where it’s needed,” API President Mike Sommers told reporters.

From Barron's • Jan. 13, 2026

This is a glimpse of the API at work in the game.

From "Warcross" by Marie Lu

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023