lineal

lin·e·al  (ln-l)

adj.

1. Belonging to or being in the direct line of descent from an ancestor.

2. Derived from or relating to a particular line of descent; hereditary.

3. Linear.

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[Middle English, from Old French, from Late Latin lnelis, consisting of lines, from Latin lnea, line; see line¹.]

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line·al·ly adv.

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lineal

Adjective

1. being in a direct line of descent from an ancestor

2. of or derived from direct descent

3. linear [Latin linea line]

Thesaurus

Adj.	1.	lineal - in a straight unbroken line of descent from parent to child; "lineal ancestors"; "lineal heirs"; "a direct descendant of the king"; "direct heredity" direct related - connected by kinship, common origin, or marriage collateral, indirect - descended from a common ancestor but through different lines; "cousins are collateral relatives"; "an indirect descendant of the Stuarts"
	2.	lineal - arranged in a line linear, one-dimensional - of or in or along or relating to a line; involving a single dimension; "a linear measurement"