relativistic quantum mechanics: Meaning and Definition of

rel'ativis'tic quan'tum mechan'ics

Pronunciation: [key]
— Physics. Physics.
  1. quantum mechanics based on a wave equation satisfying the mathematical requirements of the special theory of relativity and applying to particles of any velocity.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.