Wiktionary
n. (context aeronautics English) A mode of or period of aircraft flight involving supercruising. vb. (context aeronautics English) To cruise at supersonic speed without using afterburners.
Wikipedia
Supercruise is sustained supersonic flight of a supersonic aircraft with a useful cargo, passenger, or weapons load performed efficiently, which typically precludes the use of highly inefficient afterburners (reheat). Many well known supersonic military aircraft are not capable of supercruise as they are only able to maintain supersonic flight in short bursts (typically with afterburners) while they cruise at subsonic speeds. Aircraft such as the SR-71 Blackbird are designed to cruise at supersonic speed with afterburners enabled.
One of the most prominent and well-known examples of this type of aircraft was Concorde. Due to its long service in commercial airlines, Concorde has the record for the most time spent in supercruise; it has spent more time in supercruise than all other aircraft combined.
Usage examples of "supercruise".
For a long time stealth technology had detracted from a fighter plane's agility and power, until the advent of supercruise had alleviated some of the power problems.