In linguistics, coreference (sometimes written co-reference) occurs when two or more expressions in a text refer to the same person or thing; they have the same referent, e.g. Billi said hei would come; the proper noun Bill and the pronoun he refer to the same person, namely to Bill. Coreference is the main concept underlying binding phenomena in the field of syntax. The theory of binding explores the syntactic relationship that exists between coreferential expressions in sentences and texts. When two expressions are coreferential, the one is usually a full form (the antecedent) and the other is an abbreviated form (a proform or anaphor).
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