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unto vs. onto

unto
[uhn-too, uhn-tuh] / ˈʌn tu, ˈʌn tə /

preposition

  1. to (in its various uses, except as the accompaniment of the infinitive).

  2. until; till.

onto
[on-too, awn-, on-tuh, awn-] / ˈɒn tu, ˈɔn-, ˈɒn tə, ˈɔn- /

preposition

  1. to a place or position on; upon; on.

    to get onto a horse.

  2. Informal. in or into a state of awareness about.

    I'm onto your scheme.

adjective

  1. Mathematics. Also pertaining to a function or map from one set to another set, the range of which is the entire second set.