(idiomatic) A mentally manipulative approach to warfare involving use of techniques to demoralize or intimidate someone into surrender.

(neologism) Warfare that blends conventional warfare and irregular warfare (potentially including cyberwarfare and information warfare) — the full spectrum of conflict.

The use and management of information in pursuit of an advantage over an opponent, such as propaganda, disinformation, and gathering assurances that one's own information is accurate.

(sometimes derogatory) Conflict between sociopolitical classes.

cyberwarfare

(military) The use of toxic properties of chemical substances as weapons of war, through the intentional exposure of enemy forces to such substances.

The Christian concept of fighting against the work of preternatural evil forces, based on the biblical belief in demons or evil spirits.

combat conducted in towns and cities

The usage of Internet memes in an effort to achieve geopolitical goals or to enact social change.

The use of harmful microorganisms as a weapon of war.