Hi, very nice question. i can say that Happiness is more than just a word. It's a feeling :)) We can feel Happy if we did interesting things, when we succeed, when we be with beloved friends and family, when we enjoy our times. I think that to be happy is the thing that everyone is looking for, and if we achieved ourselves and goals and did the right things we will feel happy. Anyway cause it is a feeling, everyone will define it in a different way :)) Thanks.