Which term refers to extraneous evidence derived from outside sources regarding a contract or deed?

The term that refers to extraneous evidence derived from outside sources regarding a contract or deed is called Extraneous Evidence. In legal contexts, extraneous evidence typically includes information that is not contained within the document itself but can influence the understanding or interpretation of the agreement. This term captures the idea of additional information that may impact the meaning or enforceability of a contract or deed but is not part of the text of the document.

This concept is particularly important because courts may allow extraneous evidence to clarify ambiguities or resolve disputes over the language of a contract. Understandably, it encompasses various types of information that provide context or background, helping to elucidate what the parties intended when they entered into the contract.

The other terms, while relevant in certain areas of legal and evidentiary practice, do not specifically describe this type of evidence in the context of contracts or deeds. Testimonial evidence refers to statements made by witnesses, typically regarding their direct experiences or knowledge. Documentary evidence pertains to documents that are presented as evidence, which must usually originate from within the scope of the case or agreement being examined. External proof is a more vague term that does not specifically fit the defined concept of extraneous evidence in the context of contracts and deeds.