The term "Ultimate Loss" refers to a complete and irreversible loss. It is often used in the context of investments or business, where an investor may suffer from ultimate losses due to poor decision-making, market fluctuations, or other unforeseen circumstances that result in significant financial damage. In such cases, the investment is lost completely and there is no chance for recovery. The term can also be used more broadly to refer to any kind of loss that cannot be reversed or remedied, such as the loss of a loved one, a relationship, or a valuable possession.