An antecedent is a word or phrase that 'comes before'-- it is the word or phrase that gives a pronoun or other deictic its meaning. 'I love Paris; have you been there? -- 'Paris' is the antecedent of 'there' 'Sally bought a new dog, and she loves it' -- 'Sally' is the antecedent of 'she' and 'dog' is the antecedent of 'it'.
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