Etymology
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milieu (n.)

"surroundings, medium, environment," 1854, from French milieu, "middle, medium, mean," literally "middle place" (12c.), from mi "middle" (from Latin medius, from PIE root *medhyo- "middle") + lieu "place" (see lieu).

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Definitions of milieu

milieu (n.)
the environmental condition;
Synonyms: surroundings
From wordnet.princeton.edu