expatiate
vi.
3at#ed, 3at#ing 5< L expatiatus, pp. of expatiari, exspatiari, to go out of one‘s course, wander < ex3, out + spatiari, to walk, roam < spatium, SPACE6
1 orig., to roam or wander freely
2 to speak or write in great detail; elaborate or enlarge (on or upon)
ex[pa#ti[a4tion
n.