WordNet (r) 3.0 (2006):
ECM
    n 1: electronic warfare undertaken to prevent or reduce an
         enemy's effective use of the electromagnetic spectrum [syn:
         electronic countermeasures, ECM]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
ECM
       Enterprise Content Management
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
ECM
       Entity Coordination Management (FDDI, SMT)
V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):
ECM
       Error Correction / Correcting Mode (FAX, HDLC)
The Free On-line Dictionary of Computing (30 December 2018):
ECM
    error correcting memory.
   (1995-10-10)