something requiring great intelligence, especially mathematical ability.
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- rocket engine,
- rocket gun,
- rocket launcher,
- rocket propulsion,
- rocket salad,
- rocket scientist,
- rocket ship,
- rocket sled,
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
informal an activity requiring considerable intelligence and ability (esp in the phrase not exactly rocket science)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012