i Register
In some senses, retro- is marked as informal. Watch for register when choosing this word.
retro-
UK /ˈɹɛtɹəʊ-/ US /ˈɹɛtɹoʊ-/
prefix 5
Definitions
prefix
1
Back or backward.
2
Behind.
3
In the opposite direction.
4
Pertaining to an earlier time.
retroactive
5
Old-fashioned or old school.
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