syncategorematic

adjective

1. 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

   adj.all

   Examples

   `or' is a syncategorematic term.

   Antonyms categorematic

   Source: WordNet 3.0

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

   adjective

   Source: webster1913