Definitions from Wiktionary (affinity)

▸ noun:  A natural attraction or feeling of kinship to a person or thing.
▸ noun:  A family relationship through marriage of a relative (e.g. sister-in-law), as opposed to consanguinity (e.g. sister).
▸ noun:  A kinsman or kinswoman of a such relationship; one who is affinal.
▸ noun:  The fact of and manner in which something is related to another.
▸ noun:  Any romantic relationship.
▸ noun:  A love interest; a paramour.
▸ noun:  Any passionate love for something.
▸ noun:  (taxonomy) Resemblances between biological populations, suggesting that they have a common origin, type or stock.
▸ noun:  (geology) Structural resemblances between minerals; resemblances that suggest that they are of a common origin or type.
▸ noun:  (chemistry) An attractive force between atoms, or groups of atoms, that contributes towards their forming bonds.
▸ noun:  (medicine) The attraction between an antibody and an antigen
▸ noun:  (computing) A tendency to keep a task running on the same processor in a symmetric multiprocessing operating system to reduce the frequency of cache misses.
▸ noun:  (geometry) An automorphism of affine space.

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