English: State Party
Welsh: Gwladwriaeth sy'n Barti
Subject: Cyfraith
Welsh definition: A State party to a treaty has consented to be bound by the treaty, and for this State the treaty is in force.
Plural: Gwladwriaeth sy'n Barti
Notes: Daw’r diffiniad o gronfa dermau yr UN. Mae’r cofnod hwnnw hefyd yn nodi fel a ganlyn: “As regards the plural -- States parties, States party, State parties -- there is no set convention, e.g., in international law, though "States parties" (or States Parties) appears most frequently. This is a case of the two nouns -- States and parties -- being used in apposition.”