Contentment (noun)

1. A state of happiness and satisfaction.
2. Feeling pleased and satisfied with one's situation.

Origin:

Middle english: from old french contentement, from contenter "satisfy, content" (see content).

Examples:

1. He felt a sense of contentment after a hard day's work.
2. She found contentment in her simple life.
3. The contentment on his face was clear to see.
4. They led a life of contentment, with very little material wealth but a great deal of happiness.
5. The contentment of the child was infectious and spread to everyone around her.