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Some words used to have a different meaning. For example, according to this link, here are a list of twenty words that originally had a different meaning from the connotation that we associate it with today. One example would be nice. Before nice meant silly, now nice means that a person is kind or the antonym of mean. Is there a single-word or phrase that describes the phenomenon. It kind of reminds of a paradigm shift in science, when an idea that was thought to be true is changed. For example, the heliocentric theory replaced the geocentric theory.

The link:http://ideas.ted.com/20-words-that-once-meant-something-very-different/

marked as duplicate by Edwin Ashworth, FumbleFingers single-word-requests Aug 26 '15 at 16:29

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  • Metonomy, means use of a word outside its normal scope. – Hugh Aug 26 '15 at 7:23
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    @Hugh No; semantic change, though it may often involve metonymy, is broader. – Edwin Ashworth Aug 26 '15 at 10:31
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I think the expression you are looking for is semantic change (also semantic shift, semantic progression or semantic drift):

  • is the evolution of word usage — usually to the point that the modern meaning is radically different from the original usage. In diachronic (or historical) linguistics, semantic change is a change in one of the meanings of a word.

Wikipedia

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