Which of the following is synonymous with "ultimate"?

The term "ultimate" refers to something that is the final or last in a sequence or process. It denotes a position of being the most important or extreme in a particular context, often used to describe the final result or conclusion of something. In this case, "last" effectively captures that meaning, as it implies a definitive end point or the final stage.

The other options represent meanings that do not align with the concept of "ultimate." For instance, "initial" pertains to something occurring at the beginning, which is the opposite of final. "Uncertain" conveys a lack of certainty or clarity, and "superficial" suggests something that is shallow or lacking depth, neither of which relate to the idea of being the final or ultimate version of something.