Noun

1. the state or degree of being contented
   • 1908: Kenneth Grahame, The Wind in the Willows

     Then they got out their boat from the boat-house, sculled down the river home, and at a very late hour sat down to supper in their own cosy riverside parlour, to the Rat's great joy and contentment.

2. happiness in one's situation; satisfaction
3. the neuro-physiological experience of satisfaction and being at ease in one's situation, body, and/or mind.