All 9 Uses

treason
in
The Hunt for Red October
(Auto-generated)

There are many paths to treason.†
Chpt 3. *

treason = an act of betrayal
He paid for his treason with his life.†
Chpt 6.
This sort of thing is treasonous!†
Chpt 9.

treasonous = involving betrayal

standard suffix: The suffix "-ous" in treasonous means full of. This is the same pattern you see in words like dangerous, poisonous, and humorous.
'Senate Aide Convicted of Treason: Senator Donaldson Professes No Knowledge of Aide's Action.'†
Chpt 14.

treason = an act of betrayal
On the one hand, they can choose to believe that one of their most trusted professional officers has committed high treason on an unprecedented scale.†
Chpt 16.
Given the choice between the collective treason of ten men and an outside conspiracy, my opinion is that they will prefer the latter.†
Chpt 16.
I have not even suggested that treason might be involved.†
Chpt 16.
"Very well," the colonel said, "up to this point we have no indication of treason by the officers of the submarine?†
Chpt 16.
Whatever the answer, he had paid for his treason with his life.†
Chpt 17.

Definitions:

(1) (treason)
betraying someone or something -- typically betraying one's own country

(in this context, to betray is to not be loyal--often by helping enemies)
(2) (meaning too rare to warrant focus)