IPA: /iˈɪənɪk/
KK: /iˈɒnɪk/
Relating to an extremely long period of time, often used to describe something that lasts for ages or is timeless.
The aeonic changes in the landscape were evident after centuries of erosion.
Aeonic → It is formed from "aion" (from Greek αἰών, meaning age or eternity) and the suffix "-ic" (meaning pertaining to). The word "aeonic" refers to something that pertains to an age or is eternal in nature.
Think of 'aion' meaning age or eternity to remember that 'aeonic' describes something related to a long period or eternity.