An expression of congratulations or good wishes; the act of congratulating someone on their happiness or success.
From Latin felicitatio, formed from felicitare with the noun suffix -tion. Entered English in the 16th century as a formal way to describe the act of offering congratulations.
This word is the noun form that sounds incredibly formal and ceremonial—you might see it in old letters or formal announcements like 'the felicitation of the assembly,' which gives it an almost ceremonial weight that 'congratulations' lacks.
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