c. 1300, souder, soudiour, "fighting man, one engaged ion military service," from Old French soudier, soldier and Anglo-French variants, "one who serves in the army for pay," from Medieval Latin soldarius "a soldier" (source also of Spanish soldado, Italian soldato), literally "one having pay," from Late Latin soldum, extended sense of accusative of Latin solidus, name of a Roman gold coin, properly "coin of thick or solid...