lin·e·al /ˈlɪniəl/
  (a.)直繫的,正統的,嫡出的
  Lin·e·al a.
  1. Descending in a direct line from an ancestor; hereditary; derived from ancestors; -- opposed to collateral; as, a lineal descent or a lineal descendant.
     The prime and ancient right of lineal succession.   --Locke.
  2. Inheriting by direct descent; having the right by direct descent to succeed (to).
     For only you are lineal to the throne.   --Dryden.
  3. Composed of lines; delineated; as, lineal designs.
  4. In the direction of a line; of or pertaining to a line; measured on, or ascertained by, a line; linear; as, lineal magnitude.
  Lineal measure, the measure of length; -- usually written linear measure.
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  lineal
       adj 1: in a straight unbroken line of descent from parent to child;
              "lineal ancestors"; "lineal heirs"; "a direct
              descendant of the king"; "direct heredity" [syn: direct]
              [ant: collateral]
       2: arranged in a line