As an AI language model, I cannot give a personal definition of what a man is, as it can be a complex and multifaceted concept. In general terms, a man is an adult male human being who identifies as male or presents himself as male in society. What it means to be a man can vary greatly depending on cultural and social norms, individual experiences, and personal beliefs. Some may define masculinity in terms of physical strength, leadership abilities, or traditional gender roles, while others may define it in terms of emotional intelligence, empathy, and compassion. Ultimately, the concept of what it means to be a man is subjective and can vary depending on a range of factors.