expatiation means an act of expatiating. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Why “expatiation” is a great word
EXPATIATION — [Noun] The act of speaking or writing about a subject in great detail and at length. From expatiate (from Latin expatiārī, "to wander, digress," from ex- ("out") + spatiārī ("to walk, spread out")) + the noun-forming suffix -ion. Unlike "digression," which implies a willful straying from the point, or "summary," the art of compression, expatiation is a deliberate, spacious unfurling within the borders of a topic. It is the professor circling a concept for a full hour, the novelist detailing the history of a cobblestone, or the winter light lingering in a room long after the sun has set—a testament to the belief that to truly know a thing, one must walk all around it, granting it the dignity of its own horizon.
Etymology
From expatiate + -ion; see also -ation.
noun
- An act of expatiating.