retro UK /ˈɹɛt.ɹəʊ/US /ˈɹɛt.ɹoʊ/adjective 2noun 4forms 4 adjective2 •Of, or relating to, the past, past times, or the way things were. •Affecting things past; retroactive, ex post facto. noun4 •Past fashions or trends. •Abbreviation of retrospective.Richard Leacock's 1981 film portrait, Louise Brooks, was shown during a retro of Ms. Brooks's films at the Walker Art Center. — 1983 •Abbreviation of retrorocket. •A chess puzzle of retrograde analysis, requiring the solver to work out the history of moves leading to the position presented. formsretroes · retros · more retro · most retro