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heir apparent vs. heir presumptive

[ airuh-pair-uhnt, uh-par- ]
  1. an heir whose right is indefeasible, provided they survive their ancestor.
  2. a person whose succession to a position appears certain: His popularity makes him the chief's heir apparent.
  1. a person who is expected to be the heir but whose expectations may be canceled by the birth of a nearer heir.

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