Meaning of happy in English
1. feeling or showing pleasure or contentment; pleased or contented
I'm happy. ー I'm glad.
What are you so happy about?
You look very happy today.
He had a happy time with his friend.
3. lucky or fortunate; timely or convenient
a happy coincidence
4. used in greetings for special occasions, for example, ‘Happy Birthday’ or ‘Happy Christmas’