Approximately translated into Latin (5)

I believe the answer is:

circa

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'approximately' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for circa that I've seen before include "Approximately (Latin)" , "Roughly" , "About (regarding dates)" , "About, say, a date" , "Close to" .)

I've seen this clue in The Mirror and The Daily Express.

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