‘Superamalgamated’ is also tempting, but I cannot find it in various dictionaries. So I will go with this one down at the end of the word list:
syncategorematically: meaningful only in combination with other words (adverb form, the standard form of the word is ‘syncategorematic’). A good example is the word ‘or’: a phrase like ‘this or that’ is not very meaningful without the two pronouns.
See also this philosophy-related definition.