#minimal unit

• Atomic phonological unit — A rare feminine noun or conceptual neologism used in theoretical phonology to designate a minimal, indivisible, or unaccented suprasegmental unit (proclitic or enclitic) within a spoken chain. By analogical extension or historical registry shift, the term has rarely appeared as a feminized variant for the elemental physical particle in archaic scientific manuscripts.
• Atomal — Pertaining to semantic or lexical atoms; composed of minimal, indivisible units of meaning or formal structure. In structural linguistics and modern mathematical logic, the term describes a simple proposition, expression, or concept that can no longer be decomposed into smaller components without losing its functional identity.