Retrospective

adj. retroactive, taking effect on an earlier date; of retrospection, of contemplation of past events

Retrospective (from Latin retrospectare, "look back") generally means to take a look back at events that already have taken place. For example, the term is used in medicine, describing a look back at a patient's medical history or lifestyle.
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Noun
1. an exhibition of a representative selection of an artist's life work
(hypernym) art exhibition
Adjective
1. concerned with or related to the past; "retrospective self-justification"
(antonym) prospective
(similar) ex post facto, retroactive, retro
(see-also) backward

n. retrospective, retroactive

adj. retrospective, retroactive

(a.)
Looking backward; contemplating things past; -- opposed to prospective; as, a retrospective view.
  

(a.)
Having reference to what is past; affecting things past; retroactive; as, a retrospective law.