Open English Wordnet

(n)ancestor, ascendant, ascendent, antecedent, rootsomeone from whom you are descended (but usually more remote than a grandparent)

(n)antecedenta preceding occurrence or cause or event

(n)antecedent, forerunneranything that precedes something similar in time“phrenology was an antecedent of modern neuroscience”

(n)antecedentthe referent of an anaphor; a phrase or clause that is referred to by an anaphoric pronoun

(a)antecedentpreceding in time or order

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