In the context of the essay, happiness is defined as a state of well-being characterized by emotions ranging from contentment to intense joy. It encompasses both the fleeting moments of pleasure and the deeper, more enduring sense of fulfillment that comes from living a meaningful life. The essay explores various dimensions of happiness, including psychological, emotional, and social aspects, emphasizing that happiness is not merely the absence of negative feelings but rather the presence of positive experiences and relationships that contribute to an individual's overall life satisfaction.