onto
UK: ˈɒntuː | US: ˈɑːntuː
prep. 1. Moving to a position on top of or in contact with a surface.
prep. 2. Becoming aware of or informed about something.
prep. 3. (Mathematics) Relating to a function where every element of the codomain is mapped to by some element of the domain.
The word "onto" emerged in the early 18th century as a contraction of "on to," combining the spatial sense of "on" (from Old English on, meaning "in contact with") and the directional sense of "to" (from Old English tō, meaning "toward"). It originally emphasized movement toward a surface or position, later expanding to abstract uses in mathematics and figurative contexts.
The cat jumped onto the table.
She’s onto a new business idea.
The function maps the set A onto set B.
He climbed onto the roof to fix the antenna.
The detective is onto the suspect’s alibi.