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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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


(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.

The Astrology Book, Second Edition © 2003 Visible Ink Press®. All rights reserved.


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.
The strength of the attractive forces between an antigen and an antibody.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Third, 4[beta],25[(OH).sub.2][D.sub.3] had very little affinity, suggesting that this part of the A ring was also important and further highlighting the importance of the A ring and the region near the C3 carbon for antibody affinity. To further support these observations, we determined the apparent dissociation constant ([K.sub.d]) in serum for several of the analytes via standard Scatchard analysis (the [K.sub.d] equals the negative slope of a plot of the ratio of the concentration of bound analyte to that of free analyte vs the concentration of bound analyte).
According to antibody affinity and concentration calculation, replace the particles timely in order to maintain the population diversity and prevent premature convergence and particles into local extreme.
This is equivalent to the normal genetic mutation operator, except that the mutation ratio and values are chosen proportional to the antibody affinity, i.e.