1. A reference to a feeling of pleasure and enjoyment because of one's situation, etc.: Winifred was a happy child playing with her toys and dolls.
2. Expressing, showing, or causing feelings of enjoyment or pleasure: Marla could hear her children's happy laughter as they were playing in the living room.

Ralph would be happier if the project could be completed sooner.

3. Used in a special greeting or wish for another person on a special occasion: Father said, "Happy birthday, Jim!"

Their friends called out, "Happy traveling, Alisha and Karl!"