komponentide kindlale vahekorrale vastav keemiline ühend (vt stöhhiomeetria, stöhhiomeetriline koostis; vrd mittestöhhiomeetriline ühend), a chemical compound characterized as one that has exact and fixed composition with a small integer ratio among its atomic comonents (see: stoichiometry, stoichiometric composition; compare: non-stoichiometric compound)