| avidity | <chemistry> Strength of binding, usually of a small molecule with multiple binding sites by a larger, particularly the binding of a complex antigen by an antibody. (Affinity refers to simple receptor ligand systems.) (18 Nov 1997) |
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| avidity antibody | The sum total of the functional binding strength between a polyvariant and its antibody. The total binding strength represents the sum strength of all the affinity bonds. (05 Mar 2000) |