- AA
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3. antiaircraft.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.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.