Wordnet 3.0
NOUN (1)
1.
electronic warfare undertaken under direct control of an operational commander to locate sources of radiated electromagnetic energy for the purpose of immediate threat recognition;
[syn: electronic warfare-support measures, ESM]
WordNet (r) 3.0 (2006):
electronic warfare-support measures
n 1: electronic warfare undertaken under direct control of an
operational commander to locate sources of radiated
electromagnetic energy for the purpose of immediate threat
recognition [syn: electronic warfare-support measures,
ESM]