Adjective
Capable of being employed by itself as a term; -- said of a word.
Source: Webster's dictionarySyncategoremata are terms which are necessary for logic, but which, unlike categorematic terms, do not signify on their own behalf, but 'co-signify' with other words. Source: Internet
This means there is only a (developing, improper, "syncategorematic") potential infinity but not a (fixed, proper, "categorematic") actual infinity. Source: Internet