Noun

(wikipedia affinity) (affinities)

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 such relationship. Affinal kinsman or kinswoman.

The fact of and manner in which something is related to another.

* 1997 , Chris Horrocks, Introducing Foucault'', page 67, ''The Renaissance Episteme (Totem Books, Icon Books; ISBN 1840460865):

A “signature” was placed on all things by God to indicate their affinities' — but it was hidden, hence the search for arcane knowledge. Knowing was '''guessing''' and ' interpreting , not observing or demonstrating.

Any romantic relationship.

Any passionate love for something.

(taxonomy) resemblances between biological populations; resemblances that suggest that they are of a common origin, type or stock.

(geology) structural resemblances between minerals; resemblances that suggest that they are of a common origin or type.

(chemistry) An attractive force between atoms, or groups of atoms, that contributes towards their forming bonds

(medicine) The attraction between an antibody and an antigen

(computing) tendency to keep a task running on the same processor in a symmetric multiprocessing operating system to reduce the frequency of cache misses

(geometry) An automorphism of affine space.

Noun

(en noun)

Connection or association; the condition of being related.

* {{quote-magazine, date=2013-08-10, volume=408, issue=8848, magazine=(The Economist), author=Schumpeter

, title= Cronies and capitols , passage=Policing the relationship between government and business in a free society is difficult. Businesspeople have every right to lobby governments, and civil servants to take jobs in the private sector.}}

Kinship; being related by blood or marriage.

A romantic or sexual involvement.

A way in which two or more people behave and are involved with each other

* {{quote-news, year=2012, date=August 5, author=Nathan Rabin

, title= TV: Review: THE SIMPSONS (CLASSIC): “I Love Lisa” (season 4, episode 15; originally aired 02/11/1993) , passage=“I Love Lisa” opens with one of my favorite underappreciated running jokes from The Simpsons : the passive-aggressive, quietly contentious relationship of radio jocks Bill and Marty, whose mindless happy talk regularly gives way to charged exchanges that betray the simmering resentment and disappointment perpetually lingering just under the surface of their relationship .}}

(music) The level or degree of affinity between keys, chords and tones.