Dictionary
ty•rant
Pronunciation: (tī'runt), [key]—
n.
1. a sovereign or other ruler who uses power oppressively or unjustly.
2. any person in a position of authority who exercises power oppressively or despotically.
3. a tyrannical or compulsory influence.
4. an absolute ruler, esp. one in ancient Greece or Sicily.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.