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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. prep. On top of; to a position on; upon: The dog jumped onto the chair. See Usage Note at on.
  2. prep. Informal Fully aware of; informed about: The police are onto the robbers' plans.
  3. adj. Mathematics Of, relating to, or being a mapping such that every element of the target set referred to is the image of an element in the domain.

Century Dictionary and Cyclopedia

  1. An obsolete form of unto.
  2. Toward and upon: as, the door opens directly onto the street.
  3. To and in connection with.
  4. To the top of; upon; on.

Wiktionary

  1. prep. upon, on top of
  2. prep. aware of
  3. prep. being an onto function with a codomain of (see below)
  4. adj. assuming each of the values in its codomain; having its range equal to its codomain

GNU Webster's 1913

  1. prep. upon; on; to; -- sometimes written as one word, onto, and usually called a colloquialism; but it may be regarded in analogy with into.
  2. prep. On the top of; upon; on. See On to, under on, prep.

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‘onto’ has been looked up 2196 times, loved by 2 people, added to 9 lists, and has a Scrabble score of 4.