the quality or state of being happy.
good fortune; pleasure; contentment; joy.

1520–30; happy + -ness

overhappiness, noun

1, 2. pleasure, joy, exhilaration, bliss, contentedness, delight, enjoyment, satisfaction. Happiness, bliss, contentment, felicity imply an active or passive state of pleasure or pleasurable satisfaction. Happiness results from the possession or attainment of what one considers good: the happiness of visiting one's family. Bliss is unalloyed happiness or supreme delight: the bliss of perfect companionship. Contentment is a peaceful kind of happiness in which one rests without desires, even though every wish may not have been gratified: contentment in one's surroundings. Felicity is a formal word for happiness of an especially fortunate or intense kind: to wish a young couple felicity in life.

1. misery.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
happy (ˈhæpɪ)
adj , -pier, -piest
1.  feeling, showing, or expressing joy; pleased
2.  willing: I'd be happy to show you around
3.  causing joy or gladness
4.  fortunate; lucky: the happy position of not having to work
5.  aptly expressed; appropriate: a happy turn of phrase
6.  informal (postpositive) slightly intoxicated
7.  (in combination): happy birthday; happy Christmas
[C14: see hap1, -y1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1520s, "good fortune," from happy + -ness. Meaning "pleasant and contented mental state" is from 1590s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There may be a literal truth underlying the common-sense intuition that
  happiness and sadness are contagious.
The secret to happiness, it turns out, may not be wealth or power.
He is working on a documentary about happiness.
Instead, the best recipe for happiness is to have had loving, caring parents.
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