combination UK /ˌkɒmbɪˈneɪʃən/US /ˌkɑmbɪˈneɪʃən/noun 10forms 1 noun10 •a mix of two or more different things that are joined togethercombinations of colorsThese guidelines should be followed in combination with those given last week. •An object formed by combining.The chef experimented with new flavor combinations.Certain drug combinations can be dangerous. •A sequence of numbers or letters used to open a combination lock.The combination to their safe was the date of birth of their first child. •A rapid sequence of punches or strikes in boxing or other combat sports. •An advantageous sequence of forcing or nearly forcing moves, often initiated with a sacrifice. •One or more elements selected from a set without regard to the order of selection. •An association or alliance of people for some common purpose. •A shot where the cue ball hits a ball that strikes another ball on the table. •A motorcycle and sidecar. •Synonym of combinations (A one-piece suit of underwear). formscombinations