eclaircissement
An explanation of something obscure or unknown; clarification, enlightenment.
countable, uncountable
One of the heroes discovered, in the prize he had made, the very wife of his bosom; and his companion perceived that he had stumbled in the dark upon his own mother. Their mutual astonishment was unspeakable at this eclaircissement […].
Where it comes from
From French éclaircissement, from éclaircir (“to enlighten, to clarify”).
Adapted from the Wiktionary entry eclaircissement (CC BY-SA 4.0).