v. To bring into a state of unity; merge.v. To join (two or more substances) to make a single substance, such as a chemical compound; mix.v. To possess or exhibit in combination: The choreography, which combines artistry and athletics, is extremely innovative. v. To harvest (a grain crop) using a cutting, threshing, and cleaning machine.verb-intransitive. To become united; coalesce.verb-intransitive. To join forces for a common purpose. See Synonyms at join.verb-intransitive. Chemistry To form a compound.verb-intransitive. To harvest a grain crop using a cutting, threshing, and cleaning machine: "Norwegian bachelor farmers combining in their antique McCormacks” ( Garrison Keillor). n. A power-operated harvesting machine that cuts, threshes, and cleans grain.n. An association of people or groups united for the furtherance of political or commercial interests.n. A combination.