libīdō

Libīdō is a Latin noun from the verb libēre, meaning to please or to be pleasing. In classical Latin, libido meant desire, longing, or appetite — for food, for power, for pleasure of any kind. Cicero used it for political ambition. Sallust used it for greed. The word was not sexual by default. It was the generic force of wanting, applied to whatever a Roman wanted most.

The word appeared occasionally in English medical and philosophical texts from the sixteenth century onward, usually in its broad Latin sense. But in 1905, Sigmund Freud published Three Essays on the Theory of Sexuality and used Libido as a technical term for psychic energy derived from sexual instinct. Freud wrote in German but used the Latin word, giving it clinical authority. He later broadened his own definition — by 1920, libido in Freud's system meant all psychic energy, not just sexual drive — but the narrower meaning had already escaped into popular use.

Carl Jung disagreed with Freud's definition and proposed his own: libido as generalized psychic energy, closer to the original Latin. The Freud-Jung split in 1912 was partly a fight over this word. Freud insisted libido was fundamentally sexual; Jung said it was the energy behind all psychological functions. The public sided with Freud's version. Libido became a synonym for sex drive in English by the mid-twentieth century.

Pharmaceutical companies accelerated the narrowing. 'Low libido' is now a standard medical complaint and a marketing category. Drugs are advertised to restore it. Surveys measure it. The Latin word for desiring anything has become the English word for desiring one thing. Cicero, who used libido to describe a consul's hunger for power, would find the modern usage oddly specific.