adjective
definition
(of a function) Assuming each of the values in its codomain; having its range equal to its codomain.
example
Considered as a function on the real numbers, the exponential function is not onto.
preposition
definition
Upon; on top of.
example
My cat just jumped onto the keyboard.
definition
Aware of.
example
The thought-police were onto my plans of world domination.
definition
Being an onto function with a codomain of (see below).
example
The exponential function maps the set of real numbers onto the set of positive real numbers.
Examples of onto in a Sentence
He rolled onto his side.
She climbed onto the vehicle and settled on the soft cushion.
He tossed the hourglass onto a chair.
The man in the executioner uniform dumped her onto a familiar surgical table in a room that stank of blood.
Then he pulled back out onto the road.
I restrung it onto one of my chains.
She dropped beside him and rolled him onto his back.
She rolled onto her side, body aching from exertion.
She lay back down, hoping they hadn't noticed, then rolled onto her other side.
Bianca took one cautious step onto the frozen waves.
She took one step forward, then another, throwing herself onto the ground beside Sofi.
He rolled onto his side, watching her sleep.
She gave him an agitated look and rolled onto her stomach, twisting her head away from him.
He nudged her onto her back.
He staggered to the sofa on which Pierre was sitting and dropped onto it, covering his face with his hand.
Betsy was seated at the table, forking sausage onto her plate and smothering pancakes in maple syrup.
With effort, she rolled him onto his back.
Harder to hang onto than you thought?
Certainly he must be moved onto the bed; here it will be impossible...
Wearing a waistcoat over his cotton shirt, Ferapontov was standing before his shop which opened onto the street.
Pierre again went up onto the knoll where he had spent over an hour, and of that family circle which had received him as a member he did not find a single one.
They all rushed forward to the bridge, onto it, and to the fords and the boats.
She climbed into her wagon and dropped onto the hard seat.
She collapsed onto her bed and sobbed, the man in the corner sobbing with her.
As if Matthew thought the encouragement was intended for him, he latched onto her breast, creating a suction that sent tiny bubbles down the feeding tube.
This time he followed the main road for a while before dipping off onto a well used trail.
She rolled onto her back, unaware of how exposed she was.
Sofia dropped her backpack onto the kitchen counter, taking in the damage.
Deidre was rolled onto her side.
Dean looked up from squeezing honey from a plastic bear onto a piece of whole wheat toast smeared with peanut butter.
They drove south from town and in less than a quarter mile, turned right onto what was locally known as the Camp Bird Mine Road.
They walked to a corner and turned away from the busy main street onto a quieter side one.
He nudged her off him and onto her side then wrapped his arms around her and held her against him.
She rolled onto her back again.
She flung herself onto the bed, tears in her eyes.
Jack climbed onto her bed and stretched out.
He tossed it onto the bed and looked around.
He then formed a flange to fit the ferrule onto.
I should make too good a target for the French, besides I am afraid I should hardly be able to climb onto a horse.
Since leaving college, she'd stayed in shape through the local gym, where she lifted weights and forced herself onto a cardio machine twice a week.
Sofia tried to push him away as he lifted her onto the table.
Damian rolled onto his side and puked blood into the sand.
Jennifer said nothing more for the remainder of the trip down the mountain until the Jeep finally rolled onto pavement and they entered the still busy town.
She reclined back onto the bed, staring at the ceiling.
He scribbled them down onto another piece of paper and tore them off for Gabriel.
With effort, Deidre hauled herself up onto a branch, wrapped her legs around it in a careful balancing act then stretched upward for the next.
She lowered herself onto the sofa.
Humans don't come here unless they're dead, and even then, only a couple make it onto our supermax zoo.
He made an audible crunch when he jumped onto the snowy roof.
It slammed the creature onto a broken piece of burning word.