Retcon article
(covers information that was retroactively changed)
Expeditions from Sol System, 2123–2190

ADR looping

ADR looping was a mission that could be performed in a region of space between sectors 184/02 and 185/38 and near the Ficus sector.

In 2120, the SS Seattle was launched from Earth for a mission of ADR looping. (TNG: "Up The Long Ladder", okudagram)

In the remastered version of "Up The Long Ladder", a diplomatic mission to SR-47 replaced ADR looping.
Usage of this term was a reference to the process by the same name which involved re-recording dialogue for scenes which had already been filmed.