affinity

noun

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