An antecedent is a preceding event, condition, cause, phrase, or word. More specifically, it may refer to:

  • Antecedent (behavioral psychology), the stimulus that occurs before a trained behavior
  • Antecedent (genealogy), antonym of descendant, genealogical predecessor in family line
  • Antecedent (grammar), the noun phrase to which an anaphor refers
  • Antecedent (law), in crime, the history of a person
  • Antecedent (logic), the first half of a hypothetical proposition
  • Antecedent moisture, a hydrologic term describing the relative wetness condition of a catchment
  • A musical phrase (music) may be an antecedent or consequent phrase.