The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Something that is mixed or blended from two or more ingredients or elements before being marketed, used, or mixed further: a premix of the dry ingredients in cake batter; a premix of a multitrack recording.transitive verb pre·mixed, pre·mix·ing, pre·mix·es
To mix or blend beforehand.