0 abbreviation for to be arranged, agreed, or announced: used to say that some details of an event have not yet been decided -- 待定（to be arranged、to be agreed或to be announced的缩写）
The keynote address will be delivered by a guest speaker (TBA).
The memo mentioned several participants and someone referred to as "TBA," or to be announced.
a festival featuring Dixie Chicks, James Taylor, Bonnie Raitt, other artists TBA
