An error in time or dating, such as when something is placed in the wrong historical period (similar to anachronism).
From Greek 'a-' (without) + 'chronos' (time) + '-ism' (condition or state). A less common variant of anachronism, emphasizing temporal displacement or confusion.
An achronism is when a story messes up the timeline—like having a character use a smartphone in ancient Rome. It's the historian's nightmare and a storyteller's common mistake when they're not paying attention to when things were invented!
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