Soldier is a special noun, meaning soldier, which is the plural of Soldier and can also be interpreted as the number of soldiers.

The word "soldier" comes from soudeour in Middle English, from soudeer or soudeour in Old French, which means mercenary, and from soudee, which means the value or salary of shilling. This word is also related to the Latin soldarius in Middle Ages, which means soldier (literally "paid"). These words eventually came from the late Latin solid words, referring to the ancient Roman coins used by the Byzantine Empire.