I've [heard](http://www.youtube.com/watch?v=dWNW-NXEudk) the following definition of morality:

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> A particular action or choice is moral or right if it somehow promotes happiness, well being or health, or it somehow minimizes unnecessary harm or suffering, or both.
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> A particular action or choice is immoral or wrong if it somehow diminishes happiness, well being or health, or it somehow causes unnecessary harm or suffering, or both.
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Is this definition proposed by any known philosophers/schools of philosophy, or it's an original?