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noun (affinities)
  1. A family relationship through marriage of a relative, as opposed to consanguinity. (e.g. sister-in-law).
  2. A kinsman or kinswoman of such relationship. Affinal kinsman or kinswoman.
  3. Any romantic relationship.
  4. Any passionate love for something.
  5. (chemistry) An attractive force between atoms, or groups of atoms, that contributes towards their forming bonds
    1. The attraction between an antibody and an antigen
    Etymology: From affinité.

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