If retro means "back” and spec means "to see or look,” what is the best definition of the phrase in retrospect in the given sentence? In retrospect , I probably should have taken better notes on that topic.

“Retro” means back, and “spec” relates to seeing or looking. So “in retrospect” means looking back at or considering something that has already happened. The sentence reflects on the earlier choice to take notes, so the best definition is “in considering the past.”

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