Other forms: disposed, disposing, disposes
To dispose is to get rid of something. Dispose of the waste, dispose of the evidence, safely disposed of.
In this sense it must take of: you dispose of something rather than dispose it. On its own the verb means to arrange or to incline, which is where well disposed towards somebody comes from, and that sense is much older.
1verbdisposeTo get rid of something.
“Please dispose of your rubbish in the bins provided.”
dispose is a getting rid.
French
disposer
English, today
dispose
Borrowed from French disposer.
Etymology from Wiktionary, CC BY-SA