Related topics: School
simple or basic:
the elementary principles of justice and democracy
You've made a very elementary mistake.
2 [only before noun]
concerning the first and easiest part of a subject [↪ intermediate, advanced]:
I'm only familiar with the subject at an elementary level.
I know a little elementary science.
3 [only before noun] American EnglishSES
relating to elementary school [= primary British English]