What is the X in X-mas?
c.1300, from Old French value "worth, value" (13c.), noun use of fem. past participle of valoir "be worth," from Latin valere "be strong, be well, be of value" (see valiant). The meaning "social principle" is attested from 1918, supposedly borrowed from the language of painting. Value judgment (1892) is a loan-translation of German Werturteil.
mid-15c., probably from value (n.). Related: Valued, valuing.
value val·ue (vāl'yōō)
A principle, standard, or quality considered worthwhile or desirable.
An assigned or calculated numerical quantity.