Euphoria
Etymology
From Greek “euphoria” (the power of enduring easily), from “euphoros,” bearing well — “eu,” well, plus “pherein,” to carry. It began as a medical term for a patient’s sense of ease or well-being, then broadened to name any state of exhilarating happiness.
noun · /yoo-FOR-ee-uh/
An intense feeling of happiness, excitement, and well-being.
What it names
The soaring, almost weightless high when joy overflows and the whole body seems to sing with it.
Example
For a few days after the acceptance letter arrived she lived in a haze of pure euphoria.
Related idea
Steady contentment is calm and sustainable; euphoria is a peak — thrilling, chemical, and by nature brief, giving way once the surge subsides.