Definition of Congratulations

Noun: congratulations kun,gra-chu'ley-shunz

An expression of approval and commendation
"he always appreciated congratulations for his work";
- praise, kudos, extolment, pat on the back, hats off

Noun: congratulation kun,gra-chu'ley-shun

The act of acknowledging that someone has an occasion for celebration
- felicitation
(usually plural) an expression of pleasure at the success or good fortune of another
"I sent them my sincere congratulations on their marriage";
- felicitation