- the middle of a course, course of events, or course of action: Congress has already had cause to complain of the court's changing its interpretative rules in midcourse.
- the portion of a ballistic trajectory between the end of powered flight and the beginning of the reentry phase.
- the portion of a space trajectory between leaving the earth's vicinity and arrival at the desired destination, as another planet.
- happening or done at some point during the journey of a ship, airplane, missile, or spacecraft: When the midcourse maneuver was attempted, one engine failed to ignite and caused the space vehicle to tumble.
- happening or done in the middle of a course, course of events, or course of action: The company is conducting a rigorous midcourse assessment of the process itself.
