All 5 Uses of

dispose
in
Dune

I will ease the harshness of the place with all the powers at my disposal.
Book 3 *

disposal = command

But the more I learn, the more I feel we should dispose of him ...and soon.†
Book 3

And she saw Paul's intent: Go right to the depth of their uncertainty, dispose of that, and all the rest must follow.†
Book 3 *

The frequently discredited Pirate History of Corrino related the curious story that Fenring was responsible for the chaumurky which disposed of Elrood IX.†
Book A4 - *

RECATHS: body-function tubes linking the human waste disposal system to the cycling filters of a stillsuit.†
Book Term

Definitions:

(1) (dispose as in: dispose of the waste)
to throw away
(2) (dispose as in: dispose of the matter)
to settle something so it no longer requires attention
(3) (dispose as in: dispose of the assets)
sell or transfer to another
(4) (dispose as in: disposed the troops along...)
the arrangement, positioning, or use of things
This sense of dispose can be used in the form disposal to indicate that a person can use something as they wish -- as in:
- I am at your disposal.
- She has many assets at her disposal.
(5) (dispose as in: Is she disposed to help?)
inclined (with a tendency to; or in the mood to)

This is usually seen in the form "disposed to..." or "disposed toward..."
(6) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Less commonly, disposing of can imply killing someone.