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.
triplicate
undecuplicate, dodecuplicate, tridecuplicate...
quintuplicate sextuplicate septuplicate octuplicate nonuplicate decuplicate
Apparently most Latin prefixes give up at some point, because neither "nonuplicate" nor "decuplicate" appear in major dictionaries. Another version of 10, "decemplicate", is listed in some generated word lists as well. The next two would likely be "undecuplicate" and "duodecuplicate" (11 and 12 copies). (for further Latin-based prefixes, see the related link)
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.
The word "decemplicate" would mean making or having TEN copies. Another version is "decuplicate". Neither of these words is listed in major dictionaries. Many spell-checkers do not even recognize eight (octuplicate and octuplet are valid forms). This is obviously beyond the capability of carbon paper.