Though it's traditionally meant 'last in a progression or series,' as Merriam-Webster puts it, the word ultimate has been more often used in recent decades to mean 'the best or most extreme of its kind.' The name of a recently launched digital archive performs a rare inversion, labeling as last a creation marked not by finality but extremity.

Though it’s traditionally meant ‘last in a progression or series,’ as Merriam-Webster puts it, the word ultimate has been more often used in recent decades to mean ‘the best or most extreme of its kind.’ The name of a recently launched digital archive performs a rare inversion, labeling as last a creation marked not by finality but extremity. Open Culture, openculture.com