I. ret ‧ ro 1 /ˈretrəʊ $ -troʊ/ BrE AmE adjective
[ Date: 1900-2000 ; Language: French ; Origin: rétro , from rétrospectif 'retrospective' ]
based on styles of fashion and design from the recent past:
retro '60s fashions
II. retro 2 BrE AmE noun ( plural retros ) [countable]
[ Date: 1900-2000 ; Origin: ↑ retrospective 2 ]
American English informal a ↑ retrospective