The word "impotence" refers to the inability to achieve or maintain something that is desired or necessary. In a medical context, it commonly describes a condition where a man is unable to achieve or sustain an erection, which is also known as erectile dysfunction. However, "impotence" can also be used metaphorically to express a lack of power or effectiveness in a broader sense, such as feeling powerless to change a situation.
The term "impotence" comes from the Latin word "impotentia," where "in-" means "not" and "potentia" means "power" or "ability." Thus, it literally means "lack of power."