/ kənˌgrætʃuˈleɪʃn; NAmE / noun
1.
congratulations [ pl. ] a message congratulating sb (= saying that you are happy about their good luck or success) :
to offer / send your congratulations to sb
2.
Congratulations! used when you want to congratulate sb :
'We're getting married!' 'Congratulations!'
Congratulations on your exam results!
3.
[ U ] the act of congratulating sb :
a letter of congratulation
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WORD ORIGIN
late Middle English : from Latin congratulatio(n-) , from the verb congratulari , from con- with + gratulari show joy (from gratus pleasing).