affinity

noun13

1. •
   A natural attraction or feeling of kinship to a person or thing.
2. •
   Any passionate love for something.
3. •
   The fact of and manner in which something is related to another.
4. •
   Resemblances between biological populations, suggesting that they have a common origin, type or stock.
5. •
   Structural resemblances between minerals; resemblances that suggest that they are of a common origin or type.
6. •
   An attractive force between atoms, or groups of atoms, that contributes towards their forming bonds.
7. •
   The attraction between an antibody and an antigen
8. •
   A family relationship through marriage of a relative (e.g. sister-in-law), as opposed to consanguinity (e.g. sister).
9. •
   Any romantic relationship.
10. •
    A love interest; a paramour.

    • "Cut it short, sis, cut it short," he would growl at her if she started to murmur sweet "coo-coos" to her affinity stationed on the other end of the wire. — 1916
11. •
    A kinsman or kinswoman of a such relationship; one who is affinal.
12. •
    A tendency to keep a task running on the same processor in a symmetric multiprocessing operating system to reduce the frequency of cache misses.
13. •
    An automorphism of affine space.