様よう相そう論ろん理り学がくようそうろんりがくMeanings1nounmodal logicA branch of logic dealing with necessity, possibility, and related modalities. Technical term used in philosophy, mathematics, and computer science.様よう相そう論ろん理り学がくは、必ひつ然ぜん性せいや可か能のう性せいといった