elementary in WordNet English dictionary

1. of or being the essential or basic part
   "an elementary need for love and nurturing"
   elementary  elemental  primary 
   
2. of or pertaining to or characteristic of elementary school or elementary education
   "the elementary grades"; "elementary teachers"
   elementary 
   
3. easy and not involved or complicated
   "an elementary problem in statistics"; "elementary, my dear Watson"; "a simple game"; "found an uncomplicated solution to the problem"
   elementary  simple  uncomplicated  unproblematic