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rocket science

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noun
  1. rocketry.
  2. something requiring great intelligence, especially mathematical ability.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for rocket science

rocket science

noun
  1. informal an activity requiring considerable intelligence and ability (esp in the phrase not exactly rocket science)
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Derived Formsrocket scientist, noun
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