- Biology.
- any simple, single-celled organism.
- any of various small, flagellate, colorless ameboids with one to three flagella, especially of the genus Monas.
- an element, atom, or group having a valence of one.
- Philosophy.
- (in the metaphysics of Leibniz) an unextended, indivisible, and indestructible entity that is the basic or ultimate constituent of the universe and a microcosm of it.
- (in the philosophy of Giordano Bruno) a basic and irreducible metaphysical unit that is spatially and psychically individuated.
- any basic metaphysical entity, especially having an autonomous life.
- a single unit or entity.
- plural -ads or -ades (-əˌdiːz) philosophy
- any fundamental singular metaphysical entity, esp if autonomous
- (in the metaphysics of Leibnitz) a simple indestructible nonspatial element regarded as the unit of which reality consists
- (in the pantheistic philosophy of Giordano Bruno) a fundamental metaphysical unit that is spatially extended and psychically aware
- a single-celled organism, esp a flagellate protozoan
- an atom, ion, or radical with a valency of one
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