All 3 Uses of

demonstrate
in
Betrayed: A House of Night Novel

I demonstrated by pushing my jacket down around my elbows.†
Chpt 8 *

demonstrated = showed

No messages, though, so hopefully he's demonstrating the ability to learn.†
Chpt 9

Definitions:

(1) (demonstrate as in: It demonstrates my point.)
to show
The exact meaning of this sense of demonstrate can depend upon its context. For example:
- "I will demonstrate how to throw a Frisbee." -- show how to do something
- "I will demonstrate how much quicker the new computer is than the old one." -- show how something works
- "Her questioned demonstrated that she was listening and thinking deeply about what was said." -- showed to be true or proved
(2) (demonstrate as in: demonstrate to protest)
a public display supporting a cause -- usually joining with others in a political protest