The word "harness" generally refers to the act of controlling or utilizing something to achieve a specific purpose. It can be used in various contexts, such as harnessing resources, ideas, energy, or power. It suggests an intentional effort to use something effectively.
The word "harness" comes from the Old French term "harnais," which means "array" or "furniture," derived from the word "harneis" that means "to equip" or "to fit out." It entered the English language around the 14th century, initially referring to the equipment used to control animals, particularly horses.