onto
//ˈɒn.tuː//
Preposition
1
Moving to a position on the surface of something.
The cat jumped onto the table.
2
In a position on the surface of something.
She put the book onto the table.
3
(Mathematics) Describing a function where every element of the codomain is mapped to by at least one element of the domain; surjective.
This function is onto because every element in the codomain has a corresponding element in the domain.
Synonym
Adjective
1
(Informal) Aware of or informed about something; understanding what is happening.
She's onto our plan, so we need to be careful.