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rocket science

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noun
  1. rocketry.
  2. something requiring great intelligence, especially mathematical ability.
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)
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