Quoted or referenced someone's words or work as evidence or support for your own statement or argument.
From Old French 'citer' and Latin 'citare' (to set in motion, to summon). The meaning evolved from 'to summon' to 'to quote' because you're summoning a source or authority to support your case.
When you cite something, you're using a 2,000-year-old legal tactic—Roman lawyers would literally 'summon' authorities and witnesses; over time, summoning an author's words did the same job, giving your argument legal weight.
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