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Definitions for onto-

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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:

1575–85

onto-

  1. a combining form meaning “being”:

    ontogeny.

    Category: Affix

Origin of onto-:

< NL < Gk

Wiktionary

  1. onto-(Prefix)

    being

    2. Origin: from ὤν present participle of εἰμί

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