noun
a thing belonging or appropriate to a period other than that in which it exists, especially a thing that is conspicuously old-fashioned
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The use of a rotary phone in today's digital age is considered an anachronism.
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Having a VCR player in your living room is such an anachronism.
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Dude, using a fax machine is totally an anachronism nowadays.
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His outdated beliefs are like an anachronism in modern society.