Definitions:
combine or put together to form one substance or mass

(of a person) associate with others socially

(especially in sound recording) combine (two or more signals or soundtracks) into one

two or more different qualities, things, or people placed, combined, or considered together

a commercially prepared mixture of ingredients for making a particular type of food or a product such as concrete

a version of a recording in which the component tracks are mixed in a different way from the original