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