Definitions for ontoˈɒn tu, ˈɔn-; unstressed ˈɒn tə, ˈɔn-

This page provides all possible meanings and translations of the word onto

Random House Webster's College Dictionary

on•toˈɒn tu, ˈɔn-; unstressed ˈɒn tə, ˈɔn-(prep.)

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

  2. Informal. aware of the true nature, motive, or meaning of:

    I'm onto your tricks.

    Category: Informal

  3. (adj.)Math. pertaining to a function or map from one set to another set, the range of which is the entire second set.

    Category: Math

Origin of onto:



  1. a combining form meaning “being”:


    Category: Affix

Origin of onto-:

< NL < Gk

Kernerman English Learner's Dictionary

  1. onto(preposition)ˈɒn tu, ˈɔn-; unstressed ˈɒn tə, ˈɔn-

    on or into a particular place

    He climbed onto the stage.; The players walked out onto the tennis court.; They're still loading all the bags onto the plane.

  2. ontoˈɒn tu, ˈɔn-; unstressed ˈɒn tə, ˈɔn-

    indicates sth is added or attached

    She sewed it onto her hat.; Just add his name onto the list.

  3. ontoˈɒn tu, ˈɔn-; unstressed ˈɒn tə, ˈɔn-

    having discovered sth useful

    The researchers felt they might be onto something.

  4. ontoˈɒn tu, ˈɔn-; unstressed ˈɒn tə, ˈɔn-

    knowing that sb is doing sth wrong

    I was onto him right away.


  1. onto(Adjective)

    Assuming each of the values in its codomain; having its range equal to its codomain.

    Considered as a function on the real numbers, the exponential function is not onto.

  2. onto(Preposition)

    Upon; on top of.

    My cat just jumped onto the keyboard.

  3. onto(Preposition)

    Aware of.

    The thought-police were onto my plans of World domination.

  4. onto(Preposition)

    Being an onto function with a codomain of (see below).

    The exponential function maps the set of real numbers onto the set of positive real numbers.

British National Corpus

  1. Spoken Corpus Frequency

    Rank popularity for the word 'onto' in Spoken Corpus Frequency: #1896

  2. Written Corpus Frequency

    Rank popularity for the word 'onto' in Written Corpus Frequency: #850

Anagrams of onto

  1. noot, toon, Toon


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