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avidity

a·vid·i·ty [ ə víddətee ]


noun 
Definition:
 
1. eagerness or greed: great eagerness or enthusiasm for something

2. chemistry 
Same as  affinity (sense 6)


3. immunology strength of antigen-antibody binding: a measure of the strength with which an antibody binds to an antigen

[15th century. Directly or via French< Latin aviditas< avidus< avere "to desire"]
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