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triplicate
If 3 is triplicate, then 5 is quintuplicate. In mathematical terms, "triplicate" means three of something, while "quintuplicate" refers to five of something. So, if we follow that pattern, 5 corresponds to quintuplicate.
Writing in triplicate.
quintuplicate sextuplicate septuplicate octuplicate nonuplicate decuplicate
There is no recognised word in any dictionary, but we could form one by logic. A decahedron is a ten-sided object and decuplicate is a recognised word meaning ten copies. Similarly an icosahedron is a twenty-sided object and so we might say icosuplicate for twenty copies.