a shade of bright orange, highly visible at a great distance and in murky weather, used to color aircraft, airport towers and hangars, boats, etc., for safety or rescue purposes.
noun 1. the set of symbols and modifiers designed, principally on the basis of articulatory considerations, to provide a consistent and universally understood system for transcribing the speech sounds of any language: devised by the International Phonetic Association. Abbreviation: IPA, I.P.A. noun 1. a series of signs and letters propagated by the Association Phonétique Internationale […]
noun, Music. 1. . noun 1. (music) the frequency of 435 hertz assigned to the A above middle C, widely used until 1939 See pitch1 (sense 30)
noun 1. a radio silence observed on vessels at sea for two three-minute periods each hour to permit distress signals to be heard.
noun 1. a branch of political science dealing with the relations between nations.