Retraction
For the medical usage, please see retraction (medicine).
A retraction was a statement that refuted an earlier one, usually made in the context of journalism.
In 1947, Captain Wainwright told an unnamed "idiot in Roswell" to issue a retraction, claiming that the flying saucer they'd captured was actually a weather balloon. (DS9: "Little Green Men")
In 2373, while initially unwilling to do so, to the point of imprisonment, Professor Forra Gegen ultimately retracted his claims about Distant Origin Theory. (VOY: "Distant Origin")