← Back to eon
Full Level C2+ →
eon Etymology Atlas
an immeasurably long period of time; the largest division of geologic time Pro
Word
Root
Affix
Tap any word to open its Atlas. Pinch to zoom, drag to pan.
eon is a Level C2+ word — Pro only
Pro unlocks the Etymology Atlas for levels A2–C2 — plus FSRS-5 spaced repetition, mastery tracking, and the activity dashboard.