The meaning of HAPPINESS is a state of well-being and contentment : joy. How to use happiness in a sentence. HAPPY meaning: 1. feeling, showing, or causing pleasure or satisfaction: 2. (used in greetings for special…. Learn more. HAPPY definition: 1. feeling, showing, or causing pleasure or satisfaction: 2. (used in greetings for special…. Learn more. Happy, at its simplest, describes a state of feeling good, but the word carries far more weight than that shorthand suggests. Psychologists formally split the concept into two traditions: a hedonic version centered on pleasure and the avoidance of pain, and a eudaimonic version centered on meaning, purpose, and living up to your potential. Define happy. happy synonyms, happy pronunciation, happy translation, English dictionary definition of happy. adj. hap·pi·er , hap·pi·est 1. Enjoying, showing, or marked by pleasure, satisfaction, or joy. Someone who is happy has feelings of pleasure, usually because something nice has happened or because they feel satisfied with their life. Marina was a confident, happy child. I'm just happy to be back running. Her face relaxed into a happy smile. Happy is a feeling of joy, pleasure, or good fortune — exactly how you'd feel if you learned that you won the lottery or got accepted into your number one choice of colleges. Happy means you feel good, you are smiling, and you like what is happening right now. The meaning of HAPPY is enjoying or characterized by well-being and contentment. How to use happy in a sentence. Synonym Discussion of Happy. Happiness is a complex and multifaceted mental state that encompasses a range of positive feelings, from contentment to intense joy. It is often associated with positive life experiences, such as achieving goals, spending time with loved ones, or engaging in enjoyable activities.