syncategorematic

In logic, noting or relating to words which cannot singly express a term, but only a part of a term, as adverbs and prepositions.

In logic, a word which cannot be used as a term by itself, as an adverb or a preposition.

Not capable of being used as a term by itself; — said of words, as an adverb or preposition.

Needing other terms in order to make a meaningful constituent of language.

of a term that cannot stand as the subject or (especially) the predicate of a proposition but must be used in conjunction with other terms