onto
EnglishEdit
Alternative formsEdit
 on to (UK, Ireland and Commonwealth countries including Canada, Australia, New Zealand, South Africa etc)
EtymologyEdit
From on + to, after into. Compare Saterland Frisian antou (“up to”).
PronunciationEdit
 (stressed)
 (unstressed, before consonants) IPA^{(key)}: /ˈɒn.tə/
 (unstressed, before vowels) IPA^{(key)}: /ˈɒn.tʊ/
 Hyphenation: on‧to
PrepositionEdit
onto
 Upon; on top of.

2013 June 22, “Engineers of a different kind”, in The Economist, volume 407, number 8841, page 70:
 Privateequity nabobs bristle at being dubbed mere financiers. Piling debt onto companies’ balancesheets is only a small part of what leveraged buyouts are about, they insist. Improving the workings of the businesses they take over is just as core to their calling, if not more so. Much of their pleading is publicrelations bluster.

My cat just jumped onto the keyboard.

 (informal) Aware of.
 (The thoughtpolice were onto my plans of World domination.)
 (mathematics) 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.

TranslationsEdit
upon; on top of
AdjectiveEdit
onto (not comparable)
 (mathematics, of a function) 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.
SynonymsEdit
 (mathematics): surjective
TranslationsEdit
surjective — see surjective
See alsoEdit
 (mathematics): onetoone, injective, bijective