Pronunciation: (in-jek'shun), [key]
1. the act of injecting.
2. something that is injected.
3. a liquid injected into the body, esp. for medicinal purposes, as a hypodermic or an enema.
4. state of being hyperemic or bloodshot.
5. Math.a one-to-one function.
6. Also called insertion. Aerospace.the process of putting a spacecraft into orbit or some other desired trajectory.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.