Latent ambiguity describes uncertainty in a contract, will, deed or other legal document that is not apparent on the face of the wording, but only emerges when the words are applied to external facts. For example, a gift “to my nephew John” where the testator has two nephews called John is latently ambiguous. Across England & Wales, Scotland, Northern Ireland and Ireland, the term is not usually defined by statute but is well recognised in case law and legal commentary, particularly in contract interpretation, will construction and conveyancing. Latent ambiguity is contrasted with patent ambiguity (obvious from the document itself). Its identification is important because it can justify the admission of extrinsic evidence, such as surrounding circumstances, background facts or, in wills, evidence of the testator’s intention, to resolve the uncertainty. Courts in all four jurisdictions follow similar principles: they seek the objective meaning of the language in context, and latent ambiguity can trigger corrective interpretation or, exceptionally, rectification where the document fails to reflect the parties’ or testator’s actual agreement or intention.