d'Alembert

noun

d'A·​lem·​bert ˈda-ləm-ˌber 

ˌdä-läⁿ-ˈber

: a system of betting in which the player increases the stake by one unit each time a bet is lost and decreases the stake by one unit each time a bet is won

called also progressive system

Word History

Etymology

after Jean LeRond d'Alembert †1783 French mathematician

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