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Dedderai was a planet in Federation space, located somewhere in the the galaxy's Alpha or Beta Quadrants, in orbit of the Dedderac home system.
Dedderai was a Federation member, the homeworld of the Dedderac civilization.
In the year 2161, Dedderai was one of numerous worlds to which Earth sent ambassadors to discuss founding the United Federation of Planets. (ST novel: Starfleet: Year One)