IPA: //nʌnˌɛlɪˈmɛnˌtɛri//
KK: /nʌnˌɛlɪˈmɛnˌtɛri/
Not basic or simple; more complex or advanced than what is considered elementary.
The course covers nonelementary topics that require prior knowledge.
Nonelementary → It is formed from "non-" (meaning not) and "elementary" (from Latin "elementarius", meaning pertaining to the elements or basic). The word "nonelementary" means not pertaining to the basic elements or fundamentals.
Think of 'non-' meaning not, and 'elementary' referring to the basics — so nonelementary describes something that is not basic.