tba stands for 'to be announced'.

tba stands for 'to be announced'tba是'to be announced'（待公布）的縮寫

You see it on posters, schedules, invitations, and websites where one piece of information is not ready yet — usually the time, the place, the price, or the speaker. So a concert poster might say 'Support act: TBA', or a meeting schedule might have 'Venue: TBA'.

You see it on posters, schedules, invitations, and websites你會在海報、行程表、邀請函和網站上看到它 where one piece of information is not ready yet用在某個訊息還沒確定的時候 usually the time, the place, the price, or the speaker通常是時間、地點、價格或講者還沒定So a concert poster might say 'Support act: TBA'所以演唱會海報可能會寫'Support act: TBA'（暖場嘉賓待公布） or a meeting schedule might have 'Venue: TBA'會議行程表可能會寫'Venue: TBA'（地點待公布）

It is written English, not spoken; if you were talking, you would just say 'we haven't decided yet' or 'they'll tell us later'. You will see it written TBA, tba, or T.B.A. — all the same.

It is written English, not spoken這是書面英語，不是口語 if you were talking如果是說話 you would just say 'we haven't decided yet' or 'they'll tell us later'你只會說'we haven't decided yet'（我們還沒決定）或'they'll tell us later'（他們之後會告訴我們）You will see it written TBA, tba, or T.B.A.你會看到寫成TBA、tba或T.B.A. — all the same都是一樣的意思

Read it honestly, though: sometimes TBA really does mean the decision is coming soon, and sometimes it is a polite way of saying nobody has sorted it out and might not for a long while. Two close relatives are worth knowing: TBC ('to be confirmed'), where there is a plan but it is not final, and TBD ('to be decided' or 'to be determined'), where the choice has not been made at all.

Read it honestly, though不過老實說 sometimes TBA really does mean the decision is coming soon有時候TBA真的表示決定很快就會出來 and sometimes it is a polite way of saying nobody has sorted it out and might not for a long while有時候只是委婉地表示根本還沒人搞定，而且可能還要一陣子Two close relatives are worth knowing還有兩個很接近的說法值得知道 TBC ('to be confirmed')TBC（待確認） where there is a plan but it is not final表示已經有計畫但還沒定案 and TBD ('to be decided' or 'to be determined')還有TBD（待決定） where the choice has not been made at all表示根本還沒做出選擇