Webster's Dictionary 
(1): ( conj.) Until; till.
(2): ( prep.) To; - now used only in antiquated, formal, or scriptural style. See To.
(3): ( prep.) Until; till.
King James Dictionary 
Un'To, prep. a compound of un, on, and to of no use in the language, as it expresses no more than to. I do not find it in our mother tongue, nor is it ever used in popular discourse. It is found in writers of former times, but is entirely obsolete.