"quintuple" in the noun sense
1. quintet, quintette, quintuplet, quintuple
a set of five similar things considered as a unit
"quintuple" in the verb sense
"The population of China quintupled"
"quintuple" in the adjective sense
1. quintuple, fivefold, five-fold
having five units or components
Source: WordNet® (An amazing lexical database of English)
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