What is the definition of the verb that means to mix or combine?

The term that best describes the action of mixing or combining elements is "blend." This verb specifically conveys the idea of merging different ingredients or components into a uniform mixture. While "mingling" does suggest an interaction between items, it often implies a more social or less structured form of mixing, such as people coming together rather than a thorough combination of substances.

"Stir" refers to the act of moving a substance around to mix it, but it doesn’t fully capture the idea of bringing together distinct items in a cohesive manner; it's more about the action applied to a mixture. The verb "combine" might seem fitting, as it denotes putting elements together. However, "blend" better encompasses the smooth integration of those elements into one cohesive whole, which is synonymous with mixing properly. Thus, "blend" is the most accurate choice for the definition that specifies the complete merging of components.