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Definition of elementary : 1. Having only one principle or constituent part; consisting of a single element; simple; uncompounded; as, an elementary substance.
2. Pertaining to one of the four elements, air, water, earth, fire.
3. Pertaining to, or treating of, the elements, rudiments, or first principles of anything; initial; rudimental; introductory; as, an elementary treatise.

Synonyms:

academic, undemanding, meat-and-potatoes, rudimentary, mere, primitive, didactic, formal, ultimate, graduate, rudimental, principal, surface, start, trouble-free, unsubdivided, manageable, dim-witted, raw, dewy-eyed, advanced, applied, mindless, convenient, intrinsic, diachronic, introductory, core, inherent, master, abecedarian, come naturally/easily/easy (to someone), simple-minded, curricular, round-eyed, chief, natural, wide-eyed, beginning, effortless, easy, educational, unproblematic, main

bottom (part of speech: adjective)

bottom, base, underlying, lowest

simple (part of speech: adjective)

childlike, bald, uncomplicated, direct, terse, refined, candid, spare, crystalline, artless, unsophisticated

pure (part of speech: adjective)

basic, irreducible, blameless, angelic, primal, pure, aboriginal, immaculate, formative, primary, undiluted, purebred, basal, honorable, elemental, unadulterated, spotless, uncluttered, innocent, unsullied, undefiled, unblemished, essential, sinless, guiltless, simon-pure, stainless, monolithic, prime, nascent, faultless, austere, clear, stark, unadorned, white, unalloyed, virtuous, chaste, bare, decent, clean, atomic, untarnished, untainted, plain, indivisible, foundational, fundamental, simple

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