1. (a.) Having only one principle or constituent part; consisting of a single element; simple; uncompounded; as, an elementary substance.

2. (a.) Pertaining to, or treating of, the elements, rudiments, or first principles of anything; initial; rudimental; introductory; as, an elementary treatise.

3. (a.) Pertaining to one of the four elements, air, water, earth, fire.

ab ovo abecedarian aboriginal acid alkali antenatal austere autochthonous bare basal basic basilar beginning biochemical budding central chaste chemical chemicobiological chemicoengineering chemicomineralogical chemicophysical chemurgic clear component constituent constitutive copolymeric copolymerous creative crucial dimeric dimerous easy electrochemical elemental embryonic essential fetal formative foundational fundamental generative genetic germinal gestatory gut heteromerous homely homespun homogeneous in embryo in its infancy in ovo in the bud inaugural inceptive inchoate inchoative incipient incunabular indivisible infant infantile initial initiative initiatory integral integrant introductory inventive irreducible isomerous macrochemical material mere metameric monolithic monomerous nascent natal nonacid of a piece of the essence original parturient photochemical physicochemical phytochemical plain polymeric postnatal prefatory pregnant preliminary prenatal primal primary prime primeval primitive primogenial primordial pristine procreative protogenic pure pure and simple radical radiochemical rude rudimental rudimentary seminal severe simon-pure simple single spare stark straightforward substantial substantive thermochemical unadorned uncluttered uncomplicated underlying understandable undifferenced undifferentiated uniform unsubtle ur