I was gonna say denotation, but that leaves an extra space...
d _ _ _ _ _ _ tion
d e n o t a _ tion
d e f i n i _ tion
d e t o n a _ tion
d e m o l i _ tion
I think tbontob added an extra underscore, or he is really evil.

j/k
Edit:
Wait...
d e f o l i a tion
That's it! That's the answer!
[ November 19, 2002, 10:08: Message edited by: Imperator Fyron ]