onto

Prep

• Arriving upon or on top of (speaking of a physical or metaphorical movement).
• Aware of.
• Being an onto function with a codomain of (see below).

Adj

• Attaining each of the values in its codomain; having its image equal to its codomain.

Preposition

• To a position on; upon.

Examples

• A new drug has just come onto the market.
• Considered as a function on the real numbers, the exponential function is not onto, as it never takes on values less than or equal to zero.
• He placed his tiles onto the triple word score with glee.
• My cat just jumped onto the keyboard.
• The exponential function maps the set of real numbers onto the set of positive real numbers.
• The thought-police were onto my plans of world domination.

Synonyms

surjective

Antonyms

off, off of

Related Words

bijective, injective, one-to-one, unto