quintupling >> /ˈkwɪntjʊp(ə)l/
Definition: [verb] Increase or cause to increase fivefold.
Example: the company's revenues would quintuple over the next decade
Definition: [noun] A fivefold number or amount; a set of five.
Definition: [adjective] Consisting of five parts or things.
Example: the microscope has a motorized revolving quintuple nosepiece