congratulation
n. countablen. an expression of praise or good wishes for someone's success. You use this when you want to tell someone they did a great job.
n. an expression of praise, approval, or good wishes for a person's success or good fortune. Often used in the plural form to refer to the act of offering such praise.
She sent a card of congratulation for his new job.
The manager offered a warm congratulation to the team after they finished the project ahead of schedule.
While a single congratulation might suffice for a minor achievement, a formal ceremony is often required to acknowledge a significant promotion within the corporation.
From Middle English congratulacion, from Middle French congratulation or its etymon Latin congrātulātiō, from congrātulor (“to congratulate”). By surface analysis, congratulate + -ion.