"Happiness is that feeling that comes over you when you know life is good and you can't help but smile. It's the opposite of sadness"

freedom, Micheal . “Happiness - Dictionary Definition.” Vocabulary.com, www.vocabulary.com/dictionary/happiness.

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"happiness is a mental or emotional state of well-being which can be defined by, among others, positive or pleasant emotions ranging from contentment to intense joy"

“Happiness.” Wikipedia, Wikimedia Foundation, 20 Nov. 2017, en.wikipedia.org/wiki/Happiness.