Pertaining to or of the nature of an element or elements; primary; simple; uncompounded; incomplex: as, an elementary substance.Initial; rudimental; containing, teaching, or discussing first principles, rules, or rudiments: as, an elementary treatise or disquisition; elementary education; elementary schools.Treating of elements; collecting, digesting, or explaining principles: as, an elementary writer.Of the nature of an infinitesimal element or part.