Answer: Meaning in life
According to positive psychology as originally formulated, the true meaning of authentic happiness is the meaning in life.
Explanation:
If a person understands a true nature meaning of life than that person will not have necessity to find happiness in any other thing. Person who are looking for happiness in other things wills ever be happy.
But the person who find meaning in life than that person is always blissful. So, meaning of life is the correct answer.