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countersign Etymology Atlas
a secret password, or to add a second signature for authentication Pro
Word
Root
Affix
Tap any word to open its Atlas. Pinch to zoom, drag to pan.
countersign 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.