expressivity

[ ek-spre-siv-i-tee ]
/ ˌɛk sprɛˈsɪv ɪ ti /

noun

the quality or state of being expressive.
Genetics. the degree to which a particular gene produces its effect in an organism.
Compare penetrance.

Origin of expressivity

From the German word Expressivität, dating back to 1930–35. See expressive, -ity

British Dictionary definitions for expressivity

expressivity
/ (ˌɛksprɛˈsɪvɪtɪ) /

noun

(esp of a work of art) the quality of being expressive
genetics the strength of the effect of a gene on the phenotype