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Could you tell me what "ca. 1828" means? i.e. "ca." before a date?
What if it says "First half of 12th century (c.a. 1175)?". That seems to contradict itself...

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It means circa, which means around in the sense of more or less or approximately.

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ca. is an abbreviation from circa meaning around. So ca. 1828 means around 1828.

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