Eunoia

Eunoia is the shortest English word containing all five main vowel graphemes. It comes from the Greek word εύνοια which means well mind.

It is a rarely used medical term referring to a state of normal mental health.

In book eight of Nicomachean Ethics, Aristotle uses the term (in Greek) to refer to the kind and benevolent feelings of goodwill a spouse has which form the basis for the ethical foundation of human life.[1]

Eunoia is also the title of a Christian Bök lipogram (ISBN 1-55245-092-9) which consists of chapters written using words limited to a single vowel. Bök defines "Eunoia" as “beautiful thinking.”