(military) A military airport, providing housing and support for aircraft and personnel.

(chemistry) An imine.

(telecommunications, military, US) Communications services, such as the installation, operation, maintenance, augmentation, modification, and rehabilitation of communications networks, systems, facilities, and equipment, including off-post extensions, provided for the operation of a military post, camp, installation, station, or activity.

(chemistry) any molecular entity capable of accepting a proton from an acid

Alternative form of off base

The altitude of the base of a mass of cloud; measured by a ceilometer.

(sports) An extreme sport consisting of jumping from a fixed structure on land, using a parachute.

present participle of BASE jump

plural of base unit

A unit of measurement which is not itself defined in terms of other units, and from which other units may be derived. / The main unit of a computer or hi-fi system.