What is the definition of happiness anyway?

So many ways to define happiness. Here are some definitions of happiness to inspire you.

Finding happiness is like finding yourself. You don't find happiness, you make happiness. You choose happiness. Self-actualization is a process of discovering who you are, who you want to be and paving the way to happiness by doing what brings YOU the most meaning and contentment to your life over the long run.
This definition of happiness by David Leonhardt, The Happy Guy

True happiness is not attained through self-gratification, but through fidelity to a worthy purpose.
This definition of happiness by Helen Keller

You will never be happier than you expect. To change your happiness, change your expectation.
This definition of happiness by Bette Davis

Hope is itself a species of happiness, and, perhaps, the chief happiness which this world affords.
This definition of happiness by Samuel Johnson

Happiness is man's greatest aim in life. Tranquility and rationality are the cornerstones of happiness.
This definition of happiness by Epicurus

How do you define happiness?
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Realize that true happiness lies within you. Waste no time and effort searching for peace and contentment and joy in the world outside. Remember that there is no happiness in having or in getting, but only in giving. Reach out. Share. Smile. Hug. Happiness is a perfume you cannot pour on others without getting a few drops on yourself.
This definition of happiness by Og Mandino