Etymology Borrowed from French rétro, ultimately from Latin retro.
1
Of, or relating to, the past, past times, or the way things were.
Scientists say that while the public may think of the moon as a problem solved and a bit retro – the place astronauts visited a half-dozen times way back before Watergate and then abandoned with a giant "meh" from mankind – in fact, lunar studies is a vibrant enterprise that is yielding a wealth of surprises.2014 September 7, Natalie Angier, “The Moon comes around again [print version: Revisiting a moon that still has secrets to reveal: Supermoon revives interest in its violent origins and hidden face, International New York Times, 10 September 2014, p. 8]”, in The New York Times, archived from the original on 31 Jul 2020:
2
Affecting things past; retroactive, ex post facto.
Etymology Borrowed from French rétro, ultimately from Latin retro.
1
Past fashions or trends.
2
Abbreviation Abbreviation of retrorocket.
3
Abbreviation 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, Sightlines, volumes 16-17, page 44:
4
Board games, Chess, Games A chess puzzle of retrograde analysis, requiring the solver to work out the history of moves leading to the position presented.