a person or thing that mixes.

a person, with reference to sociability

She's a good mixer to have at a large party.

a kitchen utensil or an electrical appliance having one or more beaters and used in mixing, beating, or blending foods.

Also, mix. a beverage, as ginger ale, fruit juice, or soda water that can be combined with liquor to produce a mixed drink, esp. a highball.

Audio . an electronic device for blending, fading, substitution, etc., of sounds from various sources, as from microphones or separately recorded soundtracks, for broadcast or recording.

Radio and Television, Recording . a technician who operates a mixer in a studio.

the person responsible for the original recording of a movie soundtrack. Compare recordist .

a social event, as a party or dance, where people can meet informally.

mixing faucet.

Metallurgy . a container for blending and storing molten pig iron from several blast furnaces.