Definition of bilateral descent Bilateral descent

We found 3 definitions of bilateral descent from 2 different sources.

What does bilateral descent mean?

Noun
bilateral descent - line of descent traced through both the maternal and paternal sides of the family

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bilateral descent (Noun)
Descent traced from all biological descendants, regardless of sex and side of the family.
bilateral descent (Noun)
Descent traced from an ancestor, regardless of sex and side of the family of the intervening generations.