Abbreviation of adapt. / Abbreviation of adapted. / (imperative, medicine, in prescriptions, also spelt add.) Abbreviation of addantur.

plural of ade

Initialism of American Dialect Society. / (US, military) Initialism of Active Denial System.

Initialism of automated decision support. / (aviation) Initialism of automatic dependent surveillance. / (linguistics) Initialism of adult-directed speech.

(video games) Initialism of aim down sights.

A nickname for Adam.

plural of Ad

(Britain, dialectal or slang) Alternative form of had

(aviation) Initialism of automatic dependent surveillance - addressed. (automated transmission of location information for aircraft using an airline specified communication system)

simple past tense and past participle of add on