IM /ˌaɪ ˈem/ noun [uncountable]
(instant messaging) a type of service available on the Internet that allows you to quickly exchange written messages with people that you know

[TahlilGaran] Dictionary of Contemporary English ▲

im- /ɪm, ɪ/ prefix
the form used for in- before b, m, or p:
immobilize
impossible

[TahlilGaran] Dictionary of Contemporary English ▲

IM
IMAC (Apple Computer) 
Important Message 
Instant Message 
Intermodulation 
Intramuscular

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲

IM
See: International Maritime Organization

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲