Let us call two-sided grammatical analysis the type of grammatical analysis that will be described below. Two-sided grammatical analysis contrasts with one-sided analysis, which sees a sequence of words either as a locution type (adverbial locution, verbal locution, noun locution, etc.) or as the sequence of types of it constituent words. From the standpoint of two-sided grammatical analysis, a given sequence of words can be attributed one (synthetically) single type, and (analytically) several grammatical types corresponding one-by-one to its constituent words. The upshot is that a given sequence of words can be described from two – synthetic & analytic – different viewpoints. What is now the status of ‘de fait’, from the viewpoint of ‘two-sided grammatical analysis’? From a synthetic standpoint, it is an adverb. And from an analytic viewpoint, it is made up of one preposition (‘de’) followed by a common noun (‘fait’). Both viewpoints are complementary and cast each light on one facet of the same reality. (lacking the time to write a scholar article, but I hope the main idea should be clear…)