共同海損是為保全共同面對海上危險的財產而自願、合理地作出非常犧牲或支出所造成的損失，符合海商法條件時由有關各方按比例分擔。
General average is loss from an extraordinary sacrifice or expenditure made voluntarily and reasonably to preserve property in a common maritime peril, shared proportionately when maritime law conditions are met.