con·grat·u·la·tion 
/kənˌgrætʃəˈleɪʃən, kənˌgræʤəˈleɪʃən/ noun
plural con·grat·u·la·tions /kənˌgrætʃəˈleɪʃən, kənˌgræʤəˈleɪʃən/ noun 1 congratulations [plural] a : a message telling someone that you are happy because of his or her success or good luck : words that congratulate someone
▪ Let me offer you my congratulations for/on being elected. ▪ Please send her my congratulations.
b — used to tell someone that you are happy because of his or her success or good luck ▪ “I got promoted!” “Congratulations!” — often + on ▪ Congratulations on your promotion! ▪ Congratulations on a job well done. 2 formal : the act of telling someone that you are happy because of his or her success or good luck : the act of congratulating someone [plural] ▪ I sent her a letter/message of congratulations. [noncount] ▪ a letter/message of congratulation
▪ Let me offer you my congratulations for/on being elected. ▪ Please send her my congratulations.
b — used to tell someone that you are happy because of his or her success or good luck ▪ “I got promoted!” “Congratulations!” — often + on ▪ Congratulations on your promotion! ▪ Congratulations on a job well done.
