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2 definitions found
 for onto
From The Collaborative International Dictionary of English v.0.48 :

  Onto \On"to\, prep. [On + to. Cf. Into.]
     On the top of; upon; on. See On to, under On, prep.
     [1913 Webster] Ontogenesis

From The Free On-line Dictionary of Computing (30 December 2018) :

      A function f : A -> B is surjective or onto or a
     surjection if f A = B.  I.e. f can return any value in B.
     This means that its image is its codomain.
     Only surjections have right inverses, f' : B -> A where
     f (f' x) = x since if f were not a surjection there would be
     elements of B for which f' was not defined.
     See also bijection, injection.

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