Seal Definition: A waxed impression proving authenticity of a document. Related Terms: Chirograph In the common law, the seal was a waxed symbol impressed upon a document to indicate its owner's assent to a document.As Am. Jur. 2d points out:"By statute ... in most states in which the seal retains significance, a seal also may take the form of a ... word, scrawl or other sign."In other words, signatures have replaced the ancient seal.Am. Jur. 2d continues:"[I]n early times, documents were commonly authenticated by the use of a seal due to widespread illiteracy." Categories & Topics: Contract Law Dictionary Find you are constantly looking up definitions? Try our search provider (works in most modern browsers) If you find an error or omission in Duhaime's Legal Dictionary, or if you have legal term suggestion, we'd love to hear from you!