The word "仅仅" is formed through the process of reduplication, where the single character "仅" (meaning "only" or "merely") is simply doubled. This repetition does not create a new conceptual meaning but instead functions to intensify and emphasize the original sense of limitation or small quantity conveyed by the root character. The formation is purely structural, relying on the rhythmic and emphatic power of duplication to strengthen the adverbial force.