noun
a word or expression that is no longer in common use, typically from an earlier time period
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The use of 'thee' and 'thou' in modern English is considered an archaism.
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Using 'whilst' instead of 'while' is an archaism that some people still use.
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Dude, saying 'thy' instead of 'your' is such an archaism.
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In a world of constant change, holding onto archaisms can feel like a comforting link to the past.