the science of rocket design, development, and flight.

1925–30; rocket1 + -ry Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rocketry (ˈrɒkɪtrɪ)
the science and technology of the design, operation, maintenance, and launching of rockets

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The show begins with a history of rocketry using both live action and animated
  footage to show the progress.
Jet engines are a much more economical approach for getting a payload up high
  before rocketry is necessary.
Physicists are working on all sorts of rocketry and satellite technology that
  may be put to questionable purposes.
All the rocketry innovation won't ever make it cheap enough for any other than
  the rich to use.
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