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lineal (adj.)

late 14c., "resembling a line," from Old French lineal "pertaining to a line" (14c.), from Late Latin linealis "pertaining to a line," from linea "a string, line, thread" (see line (n.)). Compare linear. Related: Lineally.

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Definitions of lineal from WordNet

lineal (adj.)
in a straight unbroken line of descent from parent to child;
lineal ancestors
lineal heirs
Synonyms: direct
lineal (adj.)
arranged in a line;
From wordnet.princeton.edu