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Noun
- 1. aa, lava
- usage: a dry form of lava resembling clinkers
- 2. Alcoholics Anonymous, AA, nongovernmental organization, NGO
- usage: an international organization that provides a support group for persons trying to overcome alcoholism
- 3. Associate in Arts, AA, associate degree, associate
- usage: an associate degree in arts
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Definition and meaning of aa (Dictionary)