Happiness; how do you define this word?

Is it a feeling, a moment, a memory?  Is it aquired by doing more for others? And how do hope, faith, and peace fit into the equation? 
I have some opinions of my own, but I'm curious to hear what others have to say before I write about it.  I want so badly to feel MORE HAPPINESS and less sadness, fear, anxiety, and stress in my life. 
Please share with me your thoughts... 

My thoughts...

Learn from yesterday, Live for today, Hope for tomorrow ~Albert Einstein