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The Collaborative International Dictionary
Prepositional

Prepositional \Prep`o*si"tion*al\, a. [Cf. F. pr['e]positionnel.] Of or pertaining to a preposition; of the nature of a preposition.
--Early. -- Prep`o*si"tion*al*ly, adv.

Douglas Harper's Etymology Dictionary
prepositional

1754, from preposition + -al (1).

Wiktionary
prepositional

a. 1 Of, pertaining to, or of the nature of a preposition. 2 (context grammar English) Of the prepositional case. n. (context grammar English) The prepositional case.

WordNet
prepositional

adj. of or relating to or formed with a preposition; "prepositional phrase"

Wikipedia

Usage examples of "prepositional".

The noun or pronoun that completes a prepositional phrase or the meaning of a transitive verb.

There are also as yet unconfirmed reports of brain damage that results only in the inability to understand the passive voice or prepositional phrases or possessive constructions.

The prepositional form posits as a condition of language the affirmation of a relation of identity or difference: we can speak only in so far as this relation is possible.

NOTE: In the keys to this exercise, the following simplified "equivalents" are used: genitives and possessive-adjectival forms are all turned into "of"-constructions, dative forms are represented as prepositional phrases in "for", whereas allative and ablative forms are represented as phrases involving the prepositions "to" and "from", respectively.

I had behaved like a bull in a china shop, because that which could not be figured out by anthropology and ethnography, with their field research, or by the profoundest philosophical reflection -- meditation on "human nature," and which defied prepositional formulation in both neurophysiology and ethology, and which provided fertile ground for ever-proliferating metaphysics, for psychological abstrusity, and for psychoanalysis classical and linguistic, and God knows what other esoteric study -- I had attempted to cut through, like the Gordian knot, with my proof contained in nine printed pages.

The entire paragraph is one sentence, built of prepositional phrases and subordinate clauses that lead to the introduction of Stephen Blackpool.

Proper names, forms of address, nouns and verbs and prepositional phrases would appear in set positions that repeated again and again.