(SIGINT) signals intelligence definition

Definition of signals intelligence : noun

  1. A category of intelligence comprising either individually or in combination all communications intelligence, electronic intelligence, and foreign instrumentation signals intelligence, however transmitted.
  2. Intelligence derived from communications, electronic, and foreign instrumentation signals. (Source: DoD Dictionary of Military and Associated Terms.) Compare and contrast ELINT, HUMINT, IMINT, MASINT, and OSINT.