An opportunity was a set of circumstances that would make it possible to do something.
In 2367, Captain Jean-Luc Picard noted in his captain's log that the crew were en route to the Klingon home world, where he, Captain Picard, would participate in the installation ceremony of Gowron, the next designated Leader of the High Council. This visit should also provide an opportunity for one of his officers to correct a grave injustice. (TNG: "Redemption")