warfare UK /ˈwɔːfɛə/US /ˈwɔɹfɛɹ/noun 2verb 1forms 3phrases 1 noun2 •The waging of war or armed conflict against an enemy.The Philistines gathered their armies together for warfare, to fight with Israel. — 1611 •Military operations of some particular kind e.g. guerrilla warfare. verb1 •To lead a military life; to carry on continual wars. formswarfared · warfaring · warfares Phrases with warfare psychological warfareA mentally manipulative approach to warfare involving use of techniques to demoralize or intimidate someone into surrender.