Courtesy of my friend Westwood, today’s random rare word is supererogation. She got it from a philosophy class some time ago and held onto it. Hurray for words!
Supererogation (noun)
The performance of more than duty requires.
See also supererogatory (adjective), which comes from the Late Latin supererogatio from supererogare, which means to pay in addition (as SUPER-, erogare pay out).
I love the double er in this word – it seems so daring and rebellious! Not too often that we see erer in the middle of a word.