agreed-upon

the word 'agreed-upon' is a modern english compound, formed by combining the past participle 'agreed' with the preposition 'upon'. the verb 'agree' originates from the old french 'agreer', meaning "to receive with favor, take kindly", which itself derives from the vulgar latin 'aggrātāre', from the latin phrase 'ad grātum', meaning "to one's liking". the preposition 'upon' comes from old english 'uppan', a combination of 'up' and 'on'. the compound construction 'agreed-upon' emerged to function as a phrasal adjective, succinctly describing a condition, standard, or fact that has been mutually accepted or settled by prior consent, thus moving from the literal sense of "settled on" to a formalized, abstract descriptor.

this is a compound adjective formed from the past participle of the verb 'agree' and the preposition 'upon'. it functions as a single lexical unit.