Definition of: injection

(in·jek′shən) noun
1. The act of injecting, the state of being injected, or that which is injected.
2. Med. The introduction by instruments of a fluid into some cavity or tissue of the body.
3. The similar introduction of a substance into a cadaver to facilitate dissection or anatomical demonstration.
4. Any liquid or substance so introduced.
5. An enema.
6. The state of being hyperemic.