prepositional

形容词 prepositional:

1. of or relating to or formed with a preposition

prep.o.si.tion.al

adj.Grammar （形容词）【语法】
Relating to, composed of, or used as a preposition.
介词的：与介词有关的、由介词组成的或用作介词的

【引伸】
prep.osi.tionally
adv.（副词）