The best replacement for antecedent is precedent.

The best alternatives to antecedent are rated as following:
★★★★★  precedent
★★★★  consequent
★  setting event
★  referent

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Speaking about antecedent, one probably shouldn't forget about pronouns.

Other search terms related to antecedent and their ratings are:
★★★★★ pronouns
★★★★ indefinite pronoun
★★ relative pronouns
★★ indefinite pronouns
★ pronoun
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antecedent
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