Satisfying and rewarding in a deep way, giving someone a sense of meaning and happiness.
From Old English fullfyllan, combining 'full' and 'fill.' The word literally means 'to make full,' and evolved to mean satisfying a desire or obligation completely.
Fulfilling work often pays less than boring work, which is weird when you think about it—our brains value meaning and purpose over money, yet society is structured the opposite way. That gap explains a lot about modern unhappiness.
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