Etymology
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retro (adj.)

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.

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Definitions of retro
1
retro (n.)
a fashion reminiscent of the past;
2
retro (adj.)
affecting things past;
retro pay
From wordnet.princeton.edu