Happiness Shared
“Simcha is usually translated as joy, rejoicing, gladness, happiness, pleasure, or delight. In fact, simcha has a nuance untranslatable into English, Joy, happiness, pleasure, and the like are all states of mind, emotions. They belong to the individual. We can feel them alone. Simcha, by contrast, is not a private emotion. It means happiness shared. It is a social state, a predicate of “we,” not “I.” There is no such thing as feeling simcha alone.”
Collective Joy (Re'eh, Covenant & Conversation)