Legal Definition of Service of process: The delivery of a summons, subpoena, writ, or other legal document to the opposing party in a lawsuit | Discover the legal definition and significance of service of process in the world of law. Learn how this crucial act ensures all parties are properly notified and given the opportunity to respond to legal proceedings. Examples and the importance of service of process are discussed, emphasizing the need for proper documentation and equal access to justice. Consult a qualified attorney to navigate the legal process and protect your rights