onto
onto Lexical Profile
onto Game Scores & Validity
• preposition
Moving to a location on the surface of something.
"The cat leaped gracefully onto the kitchen counter."
Fully aware of or informed about someone's true nature, secret intentions, or a promising discovery (informal).
"The auditors quickly realized that the suspect knew they were onto his fraudulent scheme."
• adjective
Designating a mathematical function or mapping in which every element of the codomain is the image of at least one element of the domain; surjective.
"In linear algebra, the professor asked the students to prove whether the given transformation is an onto mapping."
Word Nuance & Usage
Carefully distinguish between the single word 'onto' (indicating movement toward and onto a surface, as in 'stepped onto the stage') and the two-word sequence 'on to' (where 'on' functions as part of a phrasal verb followed by the preposition 'to', as in 'move on to the next chapter').
Word Origin & Etymology
Formed in Middle English as a compound of the prepositions 'on' and 'to', paralleling the formation of 'into'.