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An initialism of "to be determined." Used in reference to something that is scheduled to happen but whose details have not yet been established or finalized. We're delighted to announce our third studio album, The Wings of Morning! The release date is TBD, but we'll keep everyone posted on our website and social media channels. This project has so many different moving parts that the development timeline is still very much TBD. The length of your deployment is TBD based on the needs of the area assigned to you.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.