Definition of lineal
1
:linear
2
:composed of or arranged in lines
3 a
:consisting of or being in a direct male or female line of ancestry — compare collateral 2
b
:relating to or derived from ancestors :hereditary
c
:descended in a direct line
4 a
:belonging to one lineage
- lineal relatives
b
:of, relating to, or dealing with a lineage
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