WordWeb Online

1. Deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems
   - electronic jamming, jam

1. Press tightly together or cram
   "The crowd jammed the auditorium";
   - throng, mob, pack, pile
    
2. Push down forcibly
   "The driver jammed the brake pedal to the floor"
    
3. Hurt or bruise with a squashing force
   "jam a toe";
   - crush
    
4. Interfere with or prevent the reception of signals
   "Jam the Voice of America";
   - block
    
5. Get stuck and immobilized
   "the mechanism jammed"
    
6. Crowd or pack to capacity
   "the theatre was jammed";
   - jampack [informal], ram, cram, wad
    
7. Block passage through
   "jam the path";
   - obstruct, obturate, impede, occlude, block, close up
    
8. [informal] (popular music) play music in a group, esp. improvising

Type of: break up, bruise, contuse, crowd, crowd together, cut off, disrupt, ECM, electronic countermeasures, entrammel [literary], fetter [literary], force, hinder, impede, interrupt, malfunction, misfunction, push, stuff, trammel [literary]

Encyclopedia: Jamming