The word 'tetraplicate' refers to something that is multiplied or repeated four times. However, there are several other synonyms that can be used to express the same meaning. 'Quadruplicate' is one such word that is used to denote something that is copied or replicated four times, while 'quadruple' refers to a quantity that is four times larger than the original. 'Fourfold' is another synonym that is used to indicate something that is amplified or increased by four times. Additionally, 'quadripartite' is used to describe something that is divided into four parts or sections. These synonyms can be used in various contexts to convey the same meaning as 'tetraplicate'.