All 8 Uses

treason
in
Red Prophet
(Auto-generated)

What he had done here in Canada was plain treason.†
Chpt 3

treason = an act of betrayal
For a moment Frederic thought, insanely, that La Fayette was calmly prophesying his own execution for treason.†
Chpt 3
Of course Frederic did not believe the engines would ever be as fast as horses, but that didn't matter—La Fayette did believe in them, and so the fact that he didn't bring them to Canada was pure treason.†
Chpt 3
As it is, if you made a report accusing me of treason for encouraging Stephenson to remain in Irrakwa, they'd call you home and lock you up in a padded room!†
Chpt 3
Treason?†
Chpt 3
He has the arrogance of youth; there is no treason in his heart, I know it.
Chpt 16 *

treason = betrayal
It contained the order for Napoleon Bonaparte to be placed under immediate arrest, to be returned to Paris in irons to stand trial for treason, sedition, disloyalty, and malfeasance.†
Chpt 18

treason = an act of betrayal
Treason, sedition, malfeasance, and if that weren't enough, now insubordination.†
Chpt 18

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)