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1.
Having a distorted or altered state of consciousness as a result of drug use.

Occasionally it is spelled "Alter'd"
"Dude! *he-he* I am sooo000oooo0o fuggin' altered"
by Cody April 15, 2004
 
2.
changed something/ object
Liz's mind must be altered because fernando was right and she was wrong.
by bigbootynando November 29, 2011