More than two thousand years ago Aristotle used a term that is still in wide use in psychology today: eudaimonia. It refers to a state of deep well-being in which a person feels that their life has meaning and purpose. It is often contrasted with hedonia (the origin of the word hedonism), which refers to the fleeting happiness of various pleasures. To put it another way, if hedonic happiness is what you mean when you say you’re having a good time, then eudaimonic happiness is what we mean when we say life is good.