avidity

(redirected from avidities)
Also found in: Dictionary, Thesaurus, Medical, Legal.

avidity

[ə′vid·əd·ē]
(immunology)
The total binding strength of a polyvalent antibody (an antibody that has multiple binding sites for the same antigen) with a polyvalent antigen (an antigen with multiple identical antibody-binding sites); equivalent to the sum of the affinities at each of the binding sites.