Legal Definition of Suit: A lawsuit; a litigation; an action; a civil, rather than a criminal proceeding; a proceeding taking place in a court of law where one person or persons takes action against another person or persons | Learn how to navigate potential legal disputes, protect your rights, and minimize legal risks as a business owner by understanding the legal definition of a suit. Discover examples of suits that can arise, the importance of understanding suits, and how seeking professional legal advice can safeguard your business’s interests