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1. (film) Initialism of assistant director.Examples: "A few moments later, the A.D. reappears. "They need you," she says. "And could you stop by Wardrobe?" Shannen rolls her eyes. "O.K.!" she snaps."abbreviationalt-ofcountableinitialismuncountable

2. (military) Initialism of air defence or air defense.abbreviationalt-ofcountableinitialismuncountable

3. (pharmacology) Initialism of antidepressant.abbreviationalt-ofcountableinitialismuncountable

4. (US, Navy) Initialism of auxiliary destroyer (a naval tender, a destroyer tender that tends to destroyers).NavyUSabbreviationalt-ofcountableinitialismuncountable

5. (uncountable, pathology) Initialism of Alzheimer's disease.Examples: "Many neurodegenerative diseases, including Alzheimer's disease (AD), involve pathological protein deposits."; "What the person with AD chooses to enunciate, ‘may capture something important in the way the person makes sense of his or her life and also make meaning-based connections’ (Hydén and Örulv 2009: 206)."abbreviationalt-ofinitialismuncountable

6. (aviation) Initialism of airworthiness directive.abbreviationalt-ofcountableinitialismuncountable

1. (business) Initialism of antidumping.abbreviationalt-ofinitialismnot-comparable

1. (India) Initialism of Andhra Pradesh.Indiaabbreviationalt-ofinitialism

1. (tennis) Advantage; also, designating the left-hand side, from the player's point of view, of their half of the court, where the advantage point following a deuce is always played.Examples: "[S]uddenly Agassi hits a hard heavy cross-court back hand that pulls Federer way out to his ad (= his left) side, and Federer gets to it but slices the stretch backhand short, a couple feet past the service line […]."

2. (debating) advantageExamples: "ads and disads"

1. (virology) Abbreviation of adenovirus.abbreviationalt-of