affinal

[a-fahyn-l, uh-fahyn-l, af-ahyn-l]
adjective
related by or concerning marriage.

Origin:
1600–10; < Latin affin(is) a relative + al1. See affinity

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Affinal relatives, or in-laws, are all your relatives by marriage.
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