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

 

retrospect

 noun
noun
BrE BrE//ˈretrəspekt//
 
; NAmE NAmE//ˈretrəspekt//
 
 
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Word Origin early 17th cent.: from retro- ‘back’, on the pattern of the noun prospect.Idioms
in retrospect
 
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thinking about a past event or situation, often with a different opinion of it from the one you had at the time In retrospect, I think that I was wrong. The decision seems extremely odd, in retrospect.
See the Oxford Advanced American Dictionary entry: retrospect