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The Collaborative International Dictionary of English v.0.48 (gcide)

Lineal \Lin"e*al\ (l[i^]n"[-e]*al), a. [L. linealis belonging to
a line, fr. linea line: cf. F. lin['e]al. See 3d {Line}.]
1. Descending in a direct line from an ancestor; hereditary;
derived from ancestors; -- opposed to {collateral}; as, a
lineal descent or a lineal descendant.
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The prime and ancient right of lineal succession.
--Locke.
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2. Inheriting by direct descent; having the right by direct
descent to succeed (to).
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For only you are lineal to the throne. --Dryden.
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3. Composed of lines; delineated; as, lineal designs.
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4. In the direction of a line; of or pertaining to a line;
measured on, or ascertained by, a line; linear; as, lineal
magnitude.
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{Lineal measure}, the measure of length; -- usually written
{linear measure}.
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