Combination and Alliances Com路bi路na路tion 1. the act of combining or the state of being combined. 2. a number of things combined: a combination of ideas. 3. an alliance of persons or parties: a combination in restraint of trade. Alliance 1. the act of allying or state of being allied; union; confederation 2. a formal agreement or pact, esp a military one, between two or more countries to achieve a particular aim 3. a union between families through marriage 4. affinity or correspondence in qualities or characteristics