WordReference Random House Unabridged Dictionary of American English © 2019
a•vid•i•ty  (ə vidi tē),USA pronunciation n. 
  1. eagerness;
  2. enthusiasm or dedication.
  • Latin aviditās. See avid, -ity
  • Middle French
  • late Middle English avidite 1400–50

Collins Concise English Dictionary © HarperCollins Publishers::

aˈvidity /əˈvɪdɪtɪ/ n
  1. the quality or state of being avid
  2. eagerness
  3. greed; avarice
  4. the strength of an acid or base in proportion to its degree of dissociation
  5. a measure of antigen-to-antibody binding, based on the rate of formation of the complex

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