vail n.

c. 1300, "price equal to the intrinsic worth of a thing;" late 14c., "degree to which something is useful or estimable," from Old French value "worth, price, moral worth; standing, reputation" (13c.), noun use of fem. past participle of valoir "be worth," from Latin valere "be strong, be well; be of value, be worth" (from PIE root *wal- "to be strong"). The meaning "social principle" is attested from 1918, supposedly borrowed from the language of painting. Value judgment (1889) is a loan-translation of German Werturteil.