Definition of electronic countermeasure in English:
electronic countermeasure
noun
Military
A tactical measure involving the use of electronic equipment to disrupt or impair enemy communications, radar, missile guidance systems, or other electronic hardware; usually in plural (abbreviated ECM).
Origin
1940s; earliest use found in The New York Times Book Review.
Definition of electronic countermeasure in US English:
electronic countermeasure
noun
Military
A tactical measure involving the use of electronic equipment to disrupt or impair enemy communications, radar, missile guidance systems, or other electronic hardware; usually in plural (abbreviated ECM).
Origin
1940s; earliest use found in The New York Times Book Review.