Wordnet 3.0
NOUN (1)
1. 
 the discipline that studies the principles of transmiting information and the methods by which it is delivered (as print or radio or television etc.); 
- Example: "communications is his major field of study"[syn: communications, communication theory]
WordNet (r) 3.0 (2006):
communication theory
    n 1: the discipline that studies the principles of transmiting
         information and the methods by which it is delivered (as
         print or radio or television etc.); "communications is his
         major field of study" [syn: communications,
         communication theory]