What is your definition of happiness?
How do you even define an emotion?
I'm not able to define happiness, I only know what it feels like.
It's like trying to describe a colour to a blind person, or describe a sound to a deaf person.
Or even lick your elbow.
Extremely difficult.
I think happiness is just when you feel like you're floating and there's something in your brain that's pulling the sides of your mouth into a smile and there's nothing on your shoulders and everything feels right, everything feels good and infinite.
(By the way, 'The Pursuit of Happiness' is such a nice film, I totally recommend it)