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lineal

[lin-ee-uh l] /ˈlɪn i əl/
adjective
1.
being in the direct line, as a descendant or ancestor, or in a direct line, as descent or succession.
2.
of or transmitted by lineal descent.
3.
Origin
1350-1400
1350-1400; Middle English < Late Latin līneālis. See line1, -al1
Related forms
lineally, adverb
multilineal, adjective
nonlineal, adjective
unlineal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lineally

lineal

/ˈlɪnɪəl/
adjective
1.
being in a direct line of descent from an ancestor
2.
of, involving, or derived from direct descent
3.
a less common word for linear
Derived Forms
lineally, adverb
Word Origin
C14: via Old French from Late Latin līneālis, from Latin līnealine1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for lineally
lineal
late 14c., from Fr. lineal, from L.L. linealis, from linea (see line (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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