— congratulational , adj.
/keuhn grach'euh lay"sheuhn/ or, often, /-graj'-, keuhng-/ , n.
1. the act of congratulating.
2. congratulations , an expression of joy in the success or good fortune of another.
interj.
3. congratulations , (used to express joy in the success or good fortune of another): Congratulations! You have just won the lottery!
[ 1400-50; late ME congratulation- (s. of congratulatio ), equiv. to congratulat ( us ) (see CONGRATULATE) + -ion- -ION ]