“(UR GO or AIR GO) Ergo is the Latin term for “therefore,” “hence,” “consequently,” “it follows that….” It is often used to give an air of formality to a presentation of the conclusion to an argument. Like the less frequently used Q.E.D., it implies that the person presenting the argument is “learned” or specifically trained in logic.”
Excerpted from: Trail, George Y. Rhetorical Terms and Concepts: A Contemporary Glossary. New York: Harcourt Brace, 2000.