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Noun: instant message
  1. A message sent immediately to a person or group via the internet or text message
    "She sent him an instant message to confirm the meeting time";
    - IM
Verb: instant-message  ,in-stunt'me-sij
  1. Send an instant message
    "He instant-messageed his friend about the party";
    - IM

Derived forms: instant-messaged, instant-messages, instant messages, instant-messaging

Encyclopedia: Instant message