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An initialism of "to be announced." Used in reference to something that is scheduled to happen but does not yet have a confirmed or publicly announced time or date. The product is pretty much finished, but the marketing strategy is still being developed, so its release date is TBA at the moment. After the announcement of the lead singer's hospitalization, all of the band's tour dates have been changed to "TBA."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.