Definitions
1.AdjectiveOf, relating to, or contemplating the past.
2.AdjectiveLooking backwards. (The addition of quotations indicative of this usage is being sought:)
3.AdjectiveAffecting or influencing past things; retroactive. (The addition of quotations indicative of this usage is being sought:)
4.NounAn exhibition of works from an extended period of an artist's activity.