A safety margin is an essential parameter that exists in many fields, including finance, engineering, and medicine. It is defined as the gap or cushion between the actual or expected value and the critical limit or threshold that must not be crossed to avoid negative consequences. Some synonyms for safety margin include buffer, cushion, slack, leeway, latitude, margin of error, contingency, and allowance. These words each have a slightly different connotation and can be used in different contexts. Regardless of the synonym used, a safety margin provides an added layer of protection and ensures that there is room for error or unexpected events.