Definition of IMO abbreviation from the Oxford Advanced Learner's Dictionary

 

IMO

 abbreviation
abbreviation
BrE BrE//ˌaɪ em ˈəʊ//
 
; NAmE NAmE//ˌaɪ em ˈoʊ//
 
(also IMHO)
 
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(used especially in text messages, emails, etc. to introduce your opinion about something) in my (humble) opinion It's a nice performance, not among his best, IMO.