the flying of manned or unmanned spacecraft into or in outer space.
Also, space flight.

1945–50; space + flight1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica


flight beyond Earth's atmosphere. This article deals with the basic concepts associated with the launch and return of unmanned and manned spacecraft and their travel, navigation, and rendezvous and docking in space. For the development of space travel and discussions of spacecraft and space programs and their contributions to scientific knowledge and human welfare, see space exploration. For the development and technology of rocket propulsion, see rocket. For details on rocket systems used to propel spacecraft beyond Earth's atmosphere, see launch vehicle.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The finding came in part from research in human spaceflight.
Finally, large scale private investment in practical, low cost technologies for
  human spaceflight is being made.
But it should not automatically mean that manned spaceflight be scrapped
There have always been issues about the safety and cost of human spaceflight.
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