The word "统统" is formed through the morphological process of full reduplication, where the single character "统" (tǒng), which conveys a sense of "all" or "together", is duplicated. This repetition serves not to change the core meaning but to intensify and emphasize it, creating a stronger, more comprehensive, and often more colloquial adverb meaning "all", "entirely", or "without exception". The formation is thus a straightforward doubling for rhetorical reinforcement.