Definitions for

**"Onto"**On the top of; upon; on. See On to, under On, prep.

A function f is said to map A onto B if for every b in B, there is some a in A such f(a)=b.

**Keywords:**function

A function f from X to Y where f(X)=Y.

Definitions for **"Onto"**

On the top of; upon; on. See On to, under On, prep.

A function f is said to map A onto B if for every b in B, there is some a in A such f(a)=b.

A function f from X to Y where f(X)=Y.