noun

• A (short) cessation of combat; a cease-fire, a truce.
• A formal agreement, especially between nations, to end combat.
• The armistice agreement signed between the Allies and Germany on 11 November 1918 to end World War I; (by extension) the end of World War I.
• Alternative letter-case form of Armistice (“the armistice agreement signed between the Allies and Germany on 11 November 1918 to end World War I; (by extension) the end of World War I”) [The armistice agreement signed between the Allies and Germany on 11 November 1918 to end World War I; (by extension) the end of World War I.]