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Definition of IM noun from the Oxford Advanced Learner's Dictionary

IM

noun
 
/ˌaɪ ˈem/
 
/ˌaɪ ˈem/
(informal)
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  1. [countable, uncountable] a written message sent using a system on the internet that allows people to communicate with each other very quickly; the system of sending these messages (the abbreviation for instant message)
  2. [uncountable] a system on the internet that allows people to exchange written messages with each other very quickly (the abbreviation for instant messaging)
  3. [countable] a swimming race in which competitors must swim four equal distances using a different style (backstroke, breaststroke, butterfly and freestyle) for each distance (the abbreviation for individual medley)Topics Sports: water sportsc2

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