(medicine) Initialism of Adverse Drug Effect. / (medicine) Initialism of antibody-dependent enhancement.

plural of AD

(tennis) advantage to the server

(physics, mathematics, cosmology) Initialism of anti de Sitter.

plural of Adelie

simple past tense and past participle of add up

(sports) Stoppage time.

Alternative spelling of value added

(economics, business) the amount by which the value of an article is increased at each stage of its production, exclusive of initial costs

(economics, business, of goods) having features added to a basic line or model for which the buyer is prepared to pay extra