- Of, or relating to, the past, past times, or the way things were.
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]”, The New York Times:
- 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.
- Affecting things past; retroactive, ex post facto.
of, or relating to the past, past times, or the way things were