mēlˈyə̄, -ˈyü, -ˈyə(r) noun
( plural mi·lieus -z ; also mi·lieux -(z))
Etymology: French, environment, center, midst, from Old French, center, midst, from mi middle (from Latin medius ) + lieu place, from Latin locus — more at mid , stall
1. : environment , setting
historical milieu of a novel
stylistic and dialectical speech milieus — B.H.Smeaton
2.
a. : the numbers in the middle column of the layout in roulette when a bet is placed on them
b. : the numbers 13 to 24 in the roulette layout : the second dozen