from The American Heritage® Dictionary of the English Language, 4th Edition

  • prep. On top of; to a position on; upon: The dog jumped onto the chair. See Usage Note at on.
  • prep. Informal Fully aware of; informed about: The police are onto the robbers' plans.
  • 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • prep. Upon; on top of.
  • prep. Aware of.
  • prep. Being an onto function with a codomain of (see below).
  • adj. Assuming each of the values in its codomain; having its range equal to its codomain.

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

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


Sorry, no etymologies found.


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