ret·ro 
(rĕtrō)
(rĕtrō)adj.
1. Retroactive: retro pay.
2. Involving, relating to, or reminiscent of an earlier time; retrospective: "As is often the case in retro fashion, historical accuracy is somewhat beside the point" (New York Times).
n. pl. ret·ros
Fashion or style, as in music, reminiscent of an earlier time.