WordReference Random House Learner's Dictionary of American English © 2015
un•to /ˈʌntu; unstressed -tə/USA pronunciation prep. 

    to:Do unto others as you would have them do unto you.

Collins Concise English Dictionary © HarperCollins Publishers::

unto /ˈʌntuː/ prep
  1. an archaic word for to
Etymology: 13th Century: of Scandinavian origin; see until

'unto' also found in these entries:

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