expressivity

As a noun expressivity

is (uncountable) the quality of being expressive.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between anger and expressivity

is that anger is remorse, regret while expressivity is (uncountable) the quality of being expressive.

As a noun expressivity

is (uncountable) the quality of being expressive.

As a proper noun communion is

the sacrament of holy communion.

As nouns the difference between expression and expressivity

is that expression is a particular way of phrasing an idea while expressivity is the quality of being expressive.

Expressivity is a see also of penetrance.

In genetics|lang=en terms the difference between expressivity and penetrance

is that expressivity is (genetics) the degree to which a gene affects or can affect an organism while penetrance is (genetics) the proportion of individuals carrying a particular variation of a gene that also express an associated trait.

As nouns the difference between expressivity and penetrance

is that expressivity is (uncountable) the quality of being expressive while penetrance is the quality or state of being penetrant; power of entering or piercing; penetrating power.