At`o*mic"i*ty (&?;), n. [Cf. F. atomicité.] (Chem.) Degree of atomic attraction; equivalence; valence; also (a later use) the number of atoms in an elementary molecule. See Valence.
At"om*ism (&?;), n. [Cf. F. atomisme.] The doctrine of atoms. See Atomic philosophy, under Atomic.
At"om*ist, n. [Cf. F. atomiste.] One who holds to the atomic philosophy or theory. Locke.