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affinal

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

1600–10; < Latin affin(is) a relative + -al1. See affinity
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018