AA

3. antiaircraft.
4. See author's alteration.
1. a proportional shoe width size, narrower than A and wider than AAA.
2. the smallest proportional brassiere cup size.
3. a quality rating for a corporate or municipal bond, lower than AAA and higher than A.
4. Elect. a battery size for 1.5 volt dry cells: diameter, 0.6 in. (1.4 cm); length, 2 in. (5 cm).
5. Brit. a designation for motion pictures certified as unsuitable for children under 14 unless accompanied by an adult. Cf. A (def. 11), U (def. 5), X (def. 9).

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Universalium. 2010.

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