Initialism of active pharmaceutical ingredient.
"The dosage guidelines specify that each tablet contains 500 mg of api to treat the infection."
In plain English: An API is like a digital waiter that lets different computer programs talk to each other by taking your requests and bringing back answers without you needing to know how they work behind the scenes.
"The api stopped working because he forgot to refill its water bowl."
Initialism of American Petroleum Institute.
"Mount Api is a majestic peak located in the western Himalayas of Nepal, close to the Tibetan border."
A mountain of the Himalayas in the western part of Nepal, near the border of Tibet.
The word api comes from the Tibetan term a phyi, which originally meant "grandmother." It entered English through transliteration to represent this familial title.