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extension Etymology Atlas
An extra part added to something to make it bigger or longer., Extra time allowed before something must be finished or paid. Pro
Word
Root
Affix
Tap any word to open its Atlas. Pinch to zoom, drag to pan.
extension is a Level B2 word — Pro only
Pro unlocks the Etymology Atlas for levels A2–C2 — plus FSRS-5 spaced repetition, mastery tracking, and the activity dashboard.