A quarantine was a restriction placed upon movement.
Having taken the Doctor's TARDIS on board their probe ship, the Morestran crew had it placed in quarantine. When Sarah Jane Smith exited the TARDIS, Controller Salamar had oxygen transferred into the quarantined area, recognising her dependency upon it. (TV: Planet of Evil)
In 51st century, the Tenth Doctor advised River Song to set up a quarantine beacon on the Library to ward away would-be visitors lest they come into contact with the Vashta Nerada. (TV: Silence in the Library)