Search Result for "quantum field theory":
Wordnet 3.0

NOUN (1)

1. the branch of quantum physics that is concerned with the theory of fields; it was motivated by the question of how an atom radiates light as its electrons jump from excited states; 



WordNet (r) 3.0 (2006):

quantum field theory
    n 1: the branch of quantum physics that is concerned with the
         theory of fields; it was motivated by the question of how
         an atom radiates light as its electrons jump from excited
         states