Etymology
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mixer (n.)

1610s, "worker who mixes," agent noun from mix (v.). As a type of machine that mixes, from 1876. Sense of "person" as regards sociability (with a qualifying adjective) is by 1896; the meaning "troublemaker" is attested by 1938; the sense of "social gathering to mingle and get acquainted" dates from 1916.

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Definitions of mixer

mixer (n.)
a party of people assembled to promote sociability and communal activity;
Synonyms: sociable / social
mixer (n.)
club soda or fruit juice used to mix with alcohol;
mixer (n.)
electronic equipment that mixes two or more input signals to give a single output signal;
mixer (n.)
a kitchen utensil that is used for mixing foods;
From wordnet.princeton.edu