noun, plural affinities..
a natural liking for or attraction to a person, thing, idea, etc.
a person, thing, idea, etc., for which such a natural liking or attraction is felt.
relationship by marriage or by ties other than those of blood (distinguished from consanguinity ).
inherent likeness or agreement; close resemblance or connection.
Biology. the phylogenetic relationship between two organisms or groups of organisms resulting in a resemblance in general plan or structure, or in the essential structural parts.
Chemistry. the force by which atoms are held together in chemical compounds.
of or pertaining to persons who share the same interests: to arrange charter flights for opera lovers and other affinity groups.

1275–1325; Middle English affinite < Middle French < Latin affīnitās connection by marriage. See affine, -ity

nonaffinity, noun, plural nonaffinities, adjective

affinity, infinity.

1. partiality, fondness; sympathy, leaning, bent. 4. similarity, compatibility.

1. dislike, aversion. 4. dissimilarity, disparity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
affinity (əˈfɪnɪtɪ)
n (foll by with or for) , pl -ties
1.  a natural liking, taste, or inclination towards a person or thing
2.  the person or thing so liked
3.  a close similarity in appearance or quality; inherent likeness
4.  Compare consanguinity relationship by marriage or by ties other than of blood, as by adoption
5.  similarity in structure, form, etc, between different animals, plants, or languages
6.  chem
 a.  the tendency for two substances to combine; chemical attraction
 b.  A a measure of the tendency of a chemical reaction to take place expressed in terms of the free energy change
7.  biology a measure of the degree of interaction between two molecules, such as an antigen and antibody or a hormone and its receptor
[C14: via Old French from Latin affīnitāt- connected by marriage, from affīnis bordering on, related]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "relation by mariage" (as opposed to consanguinity), from O.Fr. afinité, from L. affinitatem (nom. affinitas) "neighborhood, relationship by marriage," from affinis "adjacent," also "kin by marriage," lit. "bordering on," from ad- "to" + finis "a border, an end." Used figuratively since
c.1600 of structural relationships in chemistry, philology, etc. Meaning "natural attraction" (as though by family) is from 1610s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

affinity af·fin·i·ty (ə-fĭn'ĭ-tē)

  1. An attraction or force between particles that causes them to combine.

  2. The attraction between an antigen and an antibody.

  3. A relationship or resemblance in structure between species that suggests a common origin.

  4. The selective staining of a tissue by a dye. The selective uptake of a dye, chemical, or other substance by a tissue.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
affinity   (ə-fĭn'ĭ-tē)  Pronunciation Key 
  1. A relationship or resemblance in structure between species that suggests a common origin.

  2. An attraction or force between particles that causes them to combine, as the attraction between an antigen and an antibody.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Bible Dictionary

Affinity definition

relationship by alliance (2 Chr. 18:1) or by marriage (1 Kings 3:1). Marriages are prohibited within certain degrees of affinity, enumerated Lev. 18:6-17. Consanguinity is relationship by blood.

Easton's 1897 Bible Dictionary
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