English Dictionary

onto

/ˈɒn.tuː/

prep

Upon; on top of. / (informal) Aware of. / (mathematics) Being an onto function with a codomain of (see below).

He jumped onto the bed.

意味（1）

Upon; on top of.

Private-equity nabobs bristle at being dubbed mere financiers. Piling debt onto companies’ balance-sheets is only a small part of what leveraged buy-outs are about, they insist. Improving the workings of the businesses they take over is just as core to their calling, if not more so. Much of their pleading is public-relations bluster.

意味（2）

(informal) Aware of.

The thought-police were onto my plans of world domination.

意味（3）

(mathematics) Being an onto function with a codomain of (see below).

The exponential function maps the set of real numbers onto the set of positive real numbers.