affinity

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affinity

1. similarity in structure, form, etc., between different animals, plants, or languages
2. Chem
a. the tendency for two substances to combine; chemical attraction
b. a measure of the tendency of a chemical reaction to take place expressed in terms of the free energy change.
3. Biology a measure of the degree of interaction between two molecules, such as an antigen and antibody or a hormone and its receptor

Affinity

(religion, spiritualism, and occult)

Astrologers use the term affinity to refer to compatibility between certain planets or signs. It is also used to denote attraction between people whose charts interact harmoniously and magnetically with each other.

affinity

[ə′fin·əd·ē]
(chemistry)
The extent to which a substance or functional group can enter into a chemical reaction with a given agent. Also known as chemical affinity.
(computer science)
A specific relationship between data processing elements that requires one to be used with the other, where a choice might otherwise exist.
(immunology)
The strength of the attractive forces between an antigen and an antibody.
References in classic literature ?
Not less does the brain of Davy or of Gay-Lussac, from childhood exploring the affinities and repulsions of particles, anticipate the laws of organization.
Yet every history should be written in a wisdom which divined the range of our affinities and looked at facts as symbols.
Experiments show that a starting antibody undergoes anywhere from two to 20 mutations in the form of substitutions among its constituent amino acids, and that the antibodies' affinities for the antigen increase by a factor of 10 or so before the affinity peaks.