- Ta⇄Ta(no period),
tantalum (chemical element). - TA⇄TA(no periods),
an abbreviation for the following:
1. teaching assistant.
2. technology assessment.
3. therapeutic abortion.
4. toxin-antitoxin.
5. transactional analysis.
6. Transit Authority. - ta⇄ta, interjection, noun.
(Especially British Informal.) thank you; thanks.
Ex. Not that he said so much as a ta but it isn't the thanks you look for (Punch).