expressivityn.

1944 N.Y. Herald Tribune 28 Mar. 16/2 This equalized expressivity ends by making Beethoven sound sometimes a little meretricious as a composer.

1948 L. Spitzer Linguistics & Lit. Hist. iv. 155 The self-destruction brought about by excessive expressivity was seen by Diderot as a danger to which any artistic nature is exposed.

1961 L. F. Brosnahan Sounds of Lang. i. 16 It is not at all clear why the relative infrequency of the latter in French should have led to its selection on the grounds of expressivity.

1934 N. W. Timoféeff-Ressovsky in Biol. Reviews & Biol. Proc. Cambr. Philos. Soc. IX. 433 The phenotypic manifestation of the mutant allelomorphs may be full and constant, or it can be variable and even dependent upon other factors (low penetrance, variable expressivity and specificity of the genes).

1946 R. R. Gates Human Genetics I. ii. 15 Related to penetrance is expressivity, which means the degree to which a particular gene expresses itself.

1957 C. H. Waddington Strategy of Genes iii. 91 Geneticists commonly use the word ‘expressivity’ to indicate the degree of expression of some phenotypic character.

1962 D. K. Henderson & R. D. Gillespie Text-bk. Psychiatry (ed. 9) iv. 36 The genes have a range of variability in their manifestation which is called their expressivity.