Definition of lineal adjective from the Oxford Advanced Learner's Dictionary

 

lineal

 adjective
adjective
BrE BrE//ˈlɪniəl//
 
; NAmE NAmE//ˈlɪniəl//
 
[only before noun](formal) Family background
 
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coming in a direct line from an earlier or later generation of the same family as somebody a lineal descendant of the company’s founder See related entries: Family background Word Origin late Middle English: via Old French from late Latin linealis, from linea ‘a line’.
See the Oxford Advanced American Dictionary entry: lineal