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Definition of IM
1. Initialism. (''verb'') to instant message, typically sent/received by cell phone, PDA, or computer. ¹
2. Initialism. (''noun'') an instant message ¹
3. Initialism. (''noun'') idea management ¹
4. Initialism. (''adjective'') intramuscular ¹
5. Abbreviation. (galaxy) irregular galaxy with no coherent structure ¹
¹ Source: wiktionary.com
Medical Definition of IM
1.