Mixer (?), n.
1. One who, or that which, mixes.
[1913 Webster]
2. A person who has social intercourse with others of many sorts; a person viewed as to his casual sociability; -- commonly used with some characterizing adjective; as, “a good mixer; a bad mixer”. [Colloq. or Slang, U. S.]
[Webster 1913 Suppl.]
3. a social gathering, game, or dance organized to provide an opportunity for people to meet each other; as, “on the first night of the conference they had a wine-and-cheese mixer”.
[PJC]
4. a nonalcoholic beverage (such as fruit juice, club soda or ginger ale) added to an alcoholic beverage to produce a mixed drink.
[PJC]
5. any device used for mixing.
[PJC]
6. an electronic device for blending or manipulating sounds from different sources to produce a composite soundtrack, for an audio recording, video recording, or a movie.
[PJC]
7. The technician who operates a mixer{6.
[PJC]