The goal of a space flight. Typical missions include Earth observations, satellite deployment, planetary probes, and military surveillance. The spacecraft itself is also sometimes called the mission.
http://www.space.com/missionlaunches/index.html Well-designed site with comprehensive news coverage of crewed and uncrewed space flights worldwide. A launch log lists all major launches that have taken place since 1999.
Subjects: Astronomy and Astrophysics.