Origin and definition of the abbreviation airport?

The term "airport" is not an acronym, but rather a compound word derived from the words "air" and "port." The term "air" refers to the aircraft that use the facility, and "port" is used in the sense of a harbor or place of arrival or departure for ships.

Definition of "airport":

An airport is a facility designed for the landing and departure of aircraft. It typically consists of a runway, taxiways, aprons, hangars, and other facilities and infrastructure needed to support aircraft operations, such as control towers, navigation aids, and fueling stations. Airports also often have passenger terminals and other facilities to accommodate passengers and cargo.