The act of overturning, or the state of being overturned; entire overthrow; an overthrow from the foundation; utter ruin; destruction; as, the subversion of a government; the subversion of despotic power; the subversion of the constitution.

destroying someone's (or some group's) honesty or loyalty; undermining moral integrity; "corruption of a minor"; "the big city's subversion of rural innocence"

the act of subverting; as overthrowing or destroying a legally constituted government

Action designed to undermine the military, economic, psychological or political strength of a regime. (JCS Pub 1-02)

Subversion refers to an attempt to overthrow structures of authority, including the state. It is an overturning or uprooting. The word is present in all languages of Latin origin, originally applying to such diverse events as the military defeat of a city.