Source : Webster's Revised Unabridged Dictionary (1913)

Syncategorematic \Syn*cat`e*gor`e*mat"ic\, a. [Gr. ?; sy`n with
   + ? a predicate. See {Syn-}, and {Categorematic}.] (Logic)
   Not capable of being used as a term by itself; -- said of
   words, as an adverb or preposition.

Source : WordNet®

syncategorematic
     adj : 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; "`or' is a
           syncategorematic term" [ant: {categorematic}]