Word Study
Saturday
CIDE DICTIONARY
Saturday, n. [OE. Saterday, AS. Sæterdæg, Sæterndæg, Sæternesdæg, literally, Saturn's day, fr. L. Saturnus Saturn + AS. dæg day; cf. L. dies Saturni.].
The seventh or last day of the week; the day following Friday and preceding Sunday. [1913 Webster]
OXFORD DICTIONARY
Saturday, n. & adv.
--n. the seventh day of the week, following Friday.
--adv. colloq.
1 on Saturday.
2 (Saturdays) on Saturdays; each Saturday.
--n. the seventh day of the week, following Friday.
--adv. colloq.
1 on Saturday.
2 (Saturdays) on Saturdays; each Saturday.
Etymology
OE S{aelig}tern(es) d{aelig}g transl. of L Saturni dies day of Saturn
For further exploring for "Saturday" in Webster Dictionary Online