prepositional

the approximate amount of something (usually used prepositionally as in `in the region of')

a function word that combines with a noun or pronoun or noun phrase to form a prepositional phrase that can have an adverbial or adjectival relation to some other word n

the approximate amount of something (usually used prepositionally as in `in the region of') n

n the extended spatial location of something n a part of an animal that has a special function or is supplied by a given artery or nerve n a large indefinite location on the surface of the Earth n the approximate amount of something (usually used prepositionally as in `in the region of') n a knowledge domain that you are interested in or are communicating about

But it has come to be the almost constant prefix to the infinitive, even in situations where it has no prepositional meaning, as where the infinitive is direct object or subject