Abbreviation of advertisement. / Abbreviation of advertising. / Abbreviation of advertiser.

(tennis) advantage / (debating) advantage

to, toward

a unit or set (especially of a specified number) / (medicine, anatomy) toward

(virology) Abbreviation of adenovirus.

Abu Dhabi

(often punctuated) Initialism of anno Domini (borrowed from Latin); in the year of our Lord.

(film) Initialism of assistant director. / (military) Initialism of air defence or air defense. / (pharmacology) Initialism of antidepressant.

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

Abbreviation of adaptation. / Abbreviation of adapter. / Abbreviation of archdiocese. / (grammar, also spelt adv(.)) Abbreviation of adverb. / (also spelt ad) Abbreviation of advertisement.