Definitions from Wiktionary (HAA)

▸ noun:  Initialism of high-altitude airship.
▸ noun:  (chemistry) Initialism of haloacetic acid. [(chemistry) Any carboxylic acid in which a halogen atom takes the place of a hydrogen atom in acetic acid; a common undesirable by-product of the chlorination of drinking water.]
▸ noun:  Initialism of Honolulu Academy of Arts.
▸ noun:  (US politics) Initialism of Healthy Americans Act.





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