The emerging field of well-being science uses various terms to describe things like positive emotions and moods, the absence of negative emotions, satisfaction with life, fulfillment, and positive functioning. These include happiness, well-being, wellness, and flourishing, to name a few. The Happitalist uses them more or less interchangeably (with a preference for the broad term “well-being”) except when sources differentiate, in which case we match the sources’ terminology.