IPA: /ˌɛlɪˈmɛn.tə.rɪ.li/
KK: /ˌɛlɪˈmɛnˌtɛrɪli/
In a simple or basic manner, often relating to fundamental principles or concepts.
The teacher explained the concept elementarily so that all the students could understand it.
Elementarily → It is formed from "element" (from Latin *elementum*, meaning a basic or fundamental part) and the suffix "-ary" (meaning relating to or connected with) and the adverbial suffix "-ly" (meaning in a manner). The word "elementarily" means in a manner relating to the basic or fundamental parts.
Think of 'element' as a basic part and remember that 'elementarily' means doing something in a basic or fundamental way.