eagerness; greediness.
enthusiasm or dedication.

1400–50; late Middle English avidite < Middle French < Latin aviditās. See avid, -ity

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World English Dictionary
avidity (əˈvɪdɪtɪ)
1.  the quality or state of being avid
2.  a.  eagerness
 b.  greed; avarice
3.  chem
 a.  the strength of an acid or base in proportion to its degree of dissociation
 b.  another term for affinity
4.  immunol a measure of antigen-to-antibody binding, based on the rate of formation of the complex

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

mid-15c., from O.Fr. avidite "avidity, greed," from L. aviditatem (nom. aviditas), noun of quality from avidus (see avid).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Rai's avidity leads him into drug dealing, an activity he conceals from his friends.
Researchers have traced this avidity to the hamster's natural habits.
Indeed, their growing avidity for simulated designer wares has made fashion the chief beneficiary of virtual boom times.
Working with soft pencils, he drew the outdoor world with an almost shocking avidity.
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