| Definitions | initialism - Bachelor of Arts
- British Airways
- Buenos Aires
- (overprint on British stamps) British Administration (usually followed by a place name).

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| noun
- In ancient Egyptian mythology, a being's soul or personality, represented as a bird-headed figure, which survives after death but must be sustained with offerings of food.
- 1983: But the Ba, I remembered, could be seen as the mistress of your heart and might or might not decide to speak to you, just as the heart cannot always forgive. " Norman Mailer, Ancient Evenings
verb
- (intransitive) (obsolete) To kiss.
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