elementary (adj.)

late 14c., "having the nature of one of the four elements," from Latin elementarius "belonging to the elements or rudiments," from elementum (see element). Meaning "rudimentary, involving first principles" is from 1540s; meaning "simple" is from 1620s. In elementary school (1841) it has the "rudimentary" sense.

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Definitions of elementary from WordNet

elementary (adj.)
easy and not involved or complicated;
elementary, my dear Watson
an elementary problem in statistics
Synonyms: simple / uncomplicated / unproblematic
elementary (adj.)
of or pertaining to or characteristic of elementary school or elementary education;
elementary teachers
the elementary grades
elementary (adj.)
of or being the essential or basic part;
an elementary need for love and nurturing
Synonyms: elemental / primary / basal