contemplation of the past; a survey of past time, events, etc.

to look back in thought; refer back (often fol. by to )

to retrospect to a period in one's youth.

to look back upon; contemplate retrospectively. ?

in retrospect

in looking back on past events; upon reflection

It was, in retrospect, the happiest day of her life.

noun

forethought , prophesy , prospect

noun

hindsight , recollection , reconsideration , reexamination , remembering , remembrance , reminiscence , retrospection , review , revision , survey , afterthought , contemplate , flashback , remember