mon·ad
noun/ˈmɒnæd/, /ˈməʊnæd/
/ˈmɑːnæd/, /ˈməʊnæd/
(philosophy)- a single simple thing that cannot be divided, for example an atom or a person
单子（不可分割的实体） Word Originearly 17th cent.: via late Latin from Greek monas, monad- ‘unit’, from monos ‘alone’.