IPA: /ˌɛk.səˈtɛr.ɪk/
KK: /ɛkˈsɒtɪk/
Easy to understand and accessible to everyone; not limited to a small group of people.
The professor's lecture was exoteric, making complex ideas clear to all students.
Exoteric → It is formed from "exo-" (meaning outside) and "terikos" (meaning pertaining to). The word refers to knowledge that is intended for or likely to be understood by the general public, as opposed to esoteric knowledge, which is meant for a select few.
Think of 'outside' ('exo-') knowledge that is meant for everyone — that's what exoteric means.