Definitions from Wiktionary (elementary)

▸ adjective:  Relating to the basic, essential or fundamental part of something.
▸ adjective:  Very simple.
▸ adjective:  Relating to an elementary school.
▸ adjective:  (sciences) Fundamental: serving as a building block for more complicated structures or processes.
▸ adjective:  (physics) Relating to a subatomic particle.
▸ adjective:  (chemistry, of a reaction) Involving only a single reaction step and transition state.
▸ adjective:  (mathematics, of a square matrix) Which performs a row or column operation on another matrix when the two are multiplied; see Elementary matrix on Wikipedia.Wikipedia (Such matrices are called "elementary" because they generate the general linear group).
▸ adjective:  (mathematics, of a symmetric polynomial) Arising from Vieta's formulas; see Elementary symmetric polynomial on Wikipedia.Wikipedia
▸ adjective:  (mathematics, of an argument or proof) Straightforward, employing only basic techniques; not requiring substantial knowledge (of some particular domain, object, etc.).
▸ adjective:  (number theory, of an argument or proof, mostly historical outside the phrase "Elementary number theory") Making no use of complex analysis.
▸ adjective:  (archaic) Sublunary; not celestial; belonging to the sublunary sphere, to which the four classical elements (earth, air, fire and water) were confined; composed of or pertaining to these four elements.
▸ noun:  An elementary school.
▸ noun:  (mythology, mysticism) A supernatural being associated with the elements.

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