What does avidity mean?
Avidity is a noun describing extreme eagerness or keen enthusiasm, typically for something pleasurable or desirable such as food, reading, learning, or a hobby. Derived from the Latin avidus, meaning "greedy," the word conveys an almost physical hunger applied to non-material pursuits: one might tackle a new subject, devour a novel series, or pursue a goal with avidity. It sits at a formal register — everyday conversation favors "eagerness" or "enthusiasm" — yet it remains readily understood and adds vivid intensity to writing. Avidity appears most often in the phrase "with avidity." Beyond this figurative sense, the word has an important technical life in biochemistry and immunology, where it names the cumulative strength with which an antibody binds to its antigen, distinguishing it from the related term "affinity," which measures binding at a single site. This dual character makes avidity useful both as an expressive literary word and as a precise scientific term.
nounExtreme eagerness or enthusiasm, especially for something enjoyable such as food, learning, or an activity. In scientific contexts, it also refers to the strength with which one substance binds to another.
- Intense eagerness or enthusiasm for something.
- (Biochemistry/immunology) The overall strength of binding between an antibody and its antigen, or more generally between molecules.
"She read the entire trilogy with the avidity of a child discovering books for the first time."
"The young chess prodigy studied grandmaster games with an avidity that alarmed his parents."
"In immunology, antibody avidity reflects how firmly antibodies cling to their target antigen."
The plural "avidities" is rare in general usage but appears in scientific literature when comparing the binding strengths of different antibodies.
"The study measured the avidities of the various monoclonal antibodies."
"Avidity" comes from the Latin avidus — "greedy" — making it the formal cousin of calling someone a glutton, just for ideas instead of food.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of avidity
Avidity comes from the Latin avidus, meaning "greedy" or "eager," itself derived from the verb avere, "to desire or crave." English borrowed the word from Latin via French in the early seventeenth century, alongside its adjectival relative "avid." The same Latin root underlies words such as "avid" and "avidly." In modern science, the term was adopted to describe the combined strength of molecular binding, extending its core idea of grasping hold of something eagerly.
Related word forms
How avidity is actually used
Avidity is a somewhat formal or literary word; in everyday speech, speakers usually prefer "eagerness" or "enthusiasm." It carries a strongly positive connotation of wholehearted appetite. Its technical sense in biochemistry and immunology is a distinct, specialized usage common in academic writing.
Easily confused with avidity
Acidity means the level of acid or sourness in a substance, whereas avidity means intense eagerness — they differ by only one letter but are unrelated in meaning.
Candor means openness and honesty in speech; avidity has nothing to do with frankness and instead denotes eager enthusiasm.