retro (adj.) Look up retro at Dictionary.com
1974, from French rétro (1973), supposedly first used of a revival c.1968 of Eva Peron-inspired fashions and short for rétrograde (see retrograde). There is an isolated use in English from 1768, and the word apparently was used in 19c. French as a term in billiards. As a noun, short for retro-rocket (1948) from 1961.