Common sense comes into play here regarding clarity of the common usage of
'c.' for circa it boils down to placement in most circumstances. If one sees
a 'c.' before as in:
c. 15th
(and most likely that above would be followed by the word - century)
it would certainly be clear that it was meant to be circa. Who would take
the 'c.' in that example for anything other than 'circa.'
If after, as in:
15th c.,
it would certainly refer to century in this example.
Why would one ever use that last example to mean '15th circa' which simply
doesn't make sense.
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