n. & adv.
n. the sixth day of the week, following Thursday.
adv. colloq. 1 on Friday. 2 (Fridays) on Fridays; each Friday. girl (or man) Friday a helper or follower (after Man Friday in Defoe's Robinson Crusoe).
[ OE frigedg f. Gmc (named after Frigg the wife of Odin) ]