Which term is more used in everyday English and which in formal/professional environment?
They both mean the same, and there’s no context where one would be preferred over the other. All you really need to know is that Americans almost exclusively use counterclockwise…
…whereas Brits are just as happy using anticlockwise…
But if you want to really impress people with your knowledge of obscure/dialectal/archaic forms, you might like to note that widdershins is another synonym.
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