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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