v.tr. & refl. (often foll. by on, upon)
1. tr. express pleasure at the happiness or good fortune or excellence of (a person) (congratulated them on their success).
2 refl. think oneself fortunate or clever.
Derivatives:
congratulant adj. & n. congratulator n. congratulatory adj.
Etymology: L congratulari (as com-, gratulari show joy f. gratus pleasing)