The term "most quadruplicate" generally refers to something that occurs four times, or is four times greater than its original amount. There are several synonyms that can be used to describe this concept, such as "quadruple," "fourfold," "quadripartite," and "tetrarchic." Each of these words can be used interchangeably with "most quadruplicate" to effectively convey the idea of something being multiplied or increased significantly four times over. It's important to choose the right synonym based on the context of the sentence, but any of these options would be a suitable replacement for "most quadruplicate".