- basaltic lava having a rough surface.
- (in prescriptions) ana2.
- a proportional shoe width size, narrower than A and wider than AAA.
- the smallest proportional brassiere cup size.
- a quality rating for a corporate or municipal bond, lower than AAA and higher than A.
- a battery size for 1.5-volt dry cells: diameter, 0.6 inch (1.4 centimeters); length, 2 inches (5 centimeters).
- a designation for motion pictures certified as unsuitable for children under 14 unless accompanied by an adult.
- antiaircraft.
- Associate in Accounting.
- Associate of Arts.
- a volcanic rock consisting of angular blocks of lava with a very rough surface
- ana 1
- Alcoholics Anonymous
- anti-aircraft
- Architectural Association
- (in Britain) Automobile Association
- (in Britain) Advertising Association
- (in Britain, formerly) a film that may not be shown publicly to a child under fourteen