The League of Nations Mandate was a concept introduced under the Treaty of Versailles, which assigned territories to various world powers for administration and development. Several other terms can be used interchangeably with "League of Nations mandate" to refer to the same concept. One such expression is "trust territory," which was used to describe territories that were placed under the trusteeship of one of the Allied powers during World War I. Another related term is "colonial mandate," which refers to territories that were administered by a mandate power on behalf of the League of Nations. Lastly, "class A mandate" is a term used to categorize territories that were deemed to require the closest supervision and administration.