BAA Meaning of BAA in English transcription, транскрипция: [ ˈba, ˈbä ]intransitive verb( baaed ; baa·ing )Etymology: imitative Date: circa 1586: to make the bleat of a sheep• baa noun Merriam-Webster's Collegiate English vocabulary. Энциклопедический словарь английского языка Merriam Webster. 2003