Out of its proper time period; existing or occurring in the wrong historical era.
From Greek ana- (against) plus chronos (time), with the Latin-style suffix -ous. This is a more formal alternative to 'anachronistic' used in older English texts and scholarly writing.
The word anachronous is itself a bit anachronous—it's an old-fashioned way of saying anachronistic that most modern English speakers don't use anymore!
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