[non-klas-i-kuh l]
  1. not classical or contrary to classical precepts.
  2. Physics. pertaining to a law, theory, or observation that cannot be expressed or understood in terms of Newtonian physics.

Origin of nonclassical

First recorded in 1925–30; non- + classical
Related formsnon·clas·si·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018