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English word vigintillion comes from English million ((long and short scales) The cardinal number 1,000,000: 106.), English viginti- (Twenty.)
million (English)
(long and short scales) The cardinal number 1,000,000: 106.
viginti- (English)
Twenty.
vigintillion (English)
(cardinal) Originally, the twentieth power of a million, 10120; now (originally US) more usually 1063.