Webster's Revised Unabridged Dictionary · 1913

Unto

Unto , preposition

[Old English unto; un- (only in unto, until) unto, as far as + to to; this un- is akin to Anglo-Saxon {not transcribed} until, OFries. und Old Saxon und until, conj. (compare Old Saxon unt{not transcribed} unto, Old High German unzi), Gothic und unto, until. See To, and compare Until.]

1.
To; -- now used only in antiquated, formal, or scriptural style. See To.
2.
Until; till. [Obsolete]
He shall abide it unto the death of the priest. — Num. xxxv. 25

Unto , conjunction

Until; till. [Obsolete]
Unto this year be gone. — Chaucer