Quadruplicating means to make four identical copies of something. Some synonyms for this word include quadrupling, multiplying by four, reproducing fourfold, and copying four times. Other options include replicating, duplicating, and mirroring four times. There are a number of different words that can be used to describe the process of making four copies of something, each of which may offer a slightly different meaning or connotation. Depending on the context in which the word is being used, one of these other synonyms may be a better fit for the situation.