injection
Pluralinjections
- 1
- 2The act of pushing a substance into something, or the substance that goes in.
Like squirting glue into a crack to fill it up.
The injection of air into the balloon made it grow.
A small injection of dye helped them find the leak.
Similarinfusion, insertion, introduction
Oppositeextraction, withdrawal
Note
- 3Extra money given to a person or business to help it keep going.
Like adding fresh wood to a fire that is dying down.
The team needed a quick injection of cash to stay open.
A small injection of money saved the little shop.
Similarinfusion, boost, influx
Oppositewithdrawal
Note
- 4A way of pushing fuel into an engine under pressure.
Like a spray bottle pushing a fine mist into the engine.
Modern cars use fuel injection instead of a carburetor.
The mechanic checked the injection system on the truck.
Note
- 5The act of putting code into a program or website, often to attack it.
Like slipping a fake note into a stack of real ones.
The hacker used injection to break into the website.
A simple injection let them steal the login details.
Similarinsertion
Note
- 6The act of putting a spacecraft onto a planned path through space.
Like throwing a ball at just the right angle so it lands where you want.
The injection put the probe on a path toward the Moon.
Mission control timed the injection to reach the right orbit.
Similarinsertion
Note
- 7A buildup of blood or fluid in part of the body.
Like a sponge that has soaked up too much water.
The doctor noticed injection in the white of the patient's eye.
Redness and injection showed the area was swollen with blood.
Similarcongestion, hyperemia
Note
- 8The act of pushing materials like concrete or gravel in using high-pressure pumps.
Like filling a hole with putty pushed through a tube.
The crew used injection to fill the cracks in the foundation.
Grout injection sealed the leak under the building.
Similarpumping
Note
- 9A rule that sends each input to its own different output, with no two inputs sharing one.
Like giving every student their own locker, with no two sharing one.
Doubling each number is an injection, because every result is different.
If two inputs give the same answer, the rule is not an injection.
Note
- 10A pairing between two sets where each item in one set links to at most one item in the other.
Like a coat-check where each ticket matches at most one coat.
This pairing is an injection, because every item links to just one partner.
They checked whether the matching counts as an injection.
Note
- 11A sample for study made by filling its vessels with a special material.
Like a model of a tree's roots made by pouring plaster into the holes.
The old museum kept an injection of a frog's veins in a glass case.
Students looked closely at an injection showing tiny blood vessels.
- 12A way of fitting one of two combined pieces into the whole they form.
Like a door that lets one room open into a bigger hall.
The first injection puts set A into the combined set.
Each injection sends a piece into the larger structure.
Note
- 13The act of throwing cold water into a condenser to make a vacuum.
Like pouring cold water on hot steam to make it shrink fast.
The engineer relied on injection to cool the steam quickly.
A burst of injection dropped the pressure inside the chamber.
Note
- 14The cold water thrown into a condenser to make a vacuum.
Like the cold splash of water that makes hot steam vanish.
The injection mixed with the steam and turned it to water.
They drew the injection from a tank beside the engine.
Note
Practice
Can you tell the meanings of injection apart? Answer 3 quick questions from this page, or write your own sentence and AI will check it.
Origin
It comes from Middle French injection, from Latin iniectio. The math meaning came from French, used by Nicolas Bourbaki.