Consideration of past events; retrospective view; the capacity to look upon the past for wisdom or insight. Frequently opposed to foresight.

knowledge after the event, retrospective knowledge; cf. foreknowledge, n.

A later revelation or realization; (as a mass noun) understanding of a situation or event after it has happened or developed; hindsight.

(ˈhindsight) Seeing what has happened, and what ought to have been done, after the event; perception gained by looking backward: opposed to foresight.