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Considering or analyzing the past, with the knowledge that one has now. In retrospect, we shouldn't have invested so heavily in one sector, but there's no way we could have known about some of the risks. It's one of those lessons that you can really only learn in retrospect.
in retrospectand in hindsight
reconsidering the past with the knowledge one now has. In retrospect, I would have gone to a better college. David realized, in hindsight, that he should have finished school.
Looking backward, reflecting on the past. For example, In retrospect, he regarded his move as the best thing he'd ever done. This idiom employs retrospect in the sense of "a view of the past." [Second half of 1600s]
in ˈretrospectthinking 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.
In looking back on or reviewing the past.