[el-uh-men-tuh-ree, -tree]
pertaining to or dealing with elements, rudiments, or first principles: an elementary grammar.
of or pertaining to an elementary school: elementary teachers.
of the nature of an ultimate constituent; simple or uncompounded.
pertaining to the four elements, earth, water, air, and fire, or to the great forces of nature; elemental.
Chemistry. of or noting one or more elements.

1400–50; late Middle English elementare (< Middle French elementaire) < Latin elementārius. See element, -ary

elementarily [el-uh-men-ter-uh-lee] , adverb
elementariness, noun
nonelementary, adjective
postelementary, adjective
preelementary, adjective
quasi-elementary, adjective
superelementary, adjective
transelementary, adjective
unelementary, adjective

1. eleemosynary, elementary (see synonym study at the current entry) ; 2. elemental, elementary.

1. Elementary, primary, rudimentary refer to what is basic and fundamental. Elementary refers to the introductory, simple, easy facts or parts of a subject that must necessarily be learned first in order to understand succeeding ones: elementary arithmetic. Primary may mean much the same as elementary; however, it usually emphasizes the idea of what comes first even more than that of simplicity: primary steps. Rudimentary applies to what is undeveloped or imperfect: a rudimentary form of government.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
elementary (ˌɛlɪˈmɛntərɪ, -trɪ)
1.  not difficult; simple; rudimentary
2.  of or concerned with the first principles of a subject; introductory or fundamental
3.  maths (of a function) having the form of an algebraic, exponential, trigonometric, or a logarithmic function, or any combination of these
4.  chem another word for elemental

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1540s, rudimentary, from L. elementarius, from elementum (see element). Meaning simple is from 1620s. Elementary school is 1841.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Well, you can find that astonishing and stupendous principle in any basic
  micro-economic undergraduate elementary textbook.
Each color rod represents a different length, and they are used to help
  elementary students master simple addition and fractions.
The problem is that the school is not safe, even in elementary school.
The head of the company in charge of administering the e-rate is leaving to
  become an elementary school teacher.
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