Crystal Said:

I am writing this definition essay on terrorism so my teacher ?

We Answered:

In your prewriting start an outline on what you want to write about terrorism.
Example:
I. Definition of the term http://www.thefreedictionary.com/terrori…
II.Where does the word come from? History in back of the word...http://www.etymonline.com/index.php?term…
III.The different types of terrorism http://terrorism.about.com/od/whatisterr…
IV. Most known acts of terrorism http://en.wikipedia.org/wiki/List_of_ter…
V. Most known groups of terrorism http://en.wikipedia.org/wiki/List_of_ter…
VI. Law punishment for acts of terrorism http://www.cubaminrex.cu/English/Terrori…
There's really a lot of information on terrorism. I think this might help you get started. There's huge amount of information in Wikipedia. Good luck.