A yielding to natural impulses or inhibitions; freedom from artificial constraint, with loss of appreciation of consequences. / (obsolete) abandonment; relinquishment.

A member of Alcoholics Anonymous. / An AA battery (energy-storage device). / Initialism of affirmative action. / Initialism of air armament. / Initialism of air attaché.

Initialism of Alcoholics Anonymous; also A.A.: a self-supporting organization of alcoholic people.

(military, aviation) Initialism of anti-aircraft and anti-air; also a/a, A-A, A/A. / (military, aviation) Initialism of air-to-air. / (anatomy, medicine) Initialism of atlantoaxial.

(computer graphics, transitive) To antialias.

The first letter of the English alphabet, called a and written in the Latin script.

The ordinal number first, derived from this letter of the English alphabet, called a and written in the Latin script.

A rank, normally the highest rank, on any of various scales that assign letters. / (education) The highest letter grade assigned (disregarding plusses and minuses).

Ace. (including in card games) / Acre. / Adult; as used in film rating. / Ammeter. / (physics) Angstrom. / Answer. / (sports) An assist. / (sexuality) Asexual. / (UK, London) Arsehole. / (weaponry) Atom.

(weaponry) Atom; atomic.