A circumpositional construction is a nominal that is flagged both by a preposition and a postposition.
Many authors alternatively use the term "circumposition", treating it as a subtype of adposition. But an adposition is defined as a single morph, and a circumpositional construction by definition includes two adpositions.
circumposition (STR) = an adposition which occurs as two morphemes, one before and one after the modifier or argument head. Example: in Pashto ter maktaba poori ‘as far as the school,’ the meaning ‘as far as’ is expressed by the combination of ter preceding maktaba ‘school’ and poori following it. (Section 4.3)