Meaning of MAJOR in English

(IMPORTANT) [adjective] [before noun; not gradable] - more important, bigger or more serious than others of the same typeAll of her major plays have been translated into English.Sugar is a major cause of tooth decay.There are two problems with this situation, one major, one minor.Citrus fruits are a major source of vitamin C.There has been a major change in attitudes recently.The United States is a major influence in the United Nations.Compare minor (UNIMPORTANT).

Cambridge English vocab.      Кембриджский английский словарь.