congratulation

The story

1. Latin · derived fromcongrātulātiō
2. Middle French · derived fromcongratulation
3. Middle English · inherited fromcongratulacion
4. English todaycongratulation

From Middle English congratulacion, from Middle French congratulation or its etymon Latin congrātulātiō, from congrātulor (“to congratulate”). By surface analysis, congratulate + -ion.