unilineal

adjective
uni·lin·e·al | \ˌyü-ni-ˈli-nē-əl \

Definition of unilineal 

: tracing descent through either the maternal or paternal line only

First Known Use of unilineal

1935, in the meaning defined above

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The first known use of unilineal was in 1935

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one that holds something together

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