right·ful /ˈraɪtfəl/
  (a.)合法的,正直的,當然的
  Right·ful a.
  1. Righteous; upright; just; good; -- said of persons. [Obs.]
  2. Consonant to justice; just; as, a rightful cause.
  3. Having the right or just claim according to established laws; being or holding by right; as, the rightful heir to a throne or an estate; a rightful king.
  4. Belonging, held, or possessed by right, or by just claim; as, a rightful inheritance; rightful authority.
  Syn: -- Just; lawful; true; honest; equitable; proper.
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  rightful
       adj 1: legally valid; "a rightful inheritance" [syn: rightful(a)]
       2: having a legally established claim; "the legitimate heir";
          "the true and lawful king" [syn: true(a), lawful, rightful(a)]