expatiate
ex.pa.ti.ate \ek-'spa--she--.a-t\ \(.)ek-.spa--she--'a--sh*n\ vi [L exspatiatus, pp. of exspatiari to wander, digress, fr. ex]+ spatium space, course - more at SPEED 1: to move about freely or at will : WANDER 2: to speak or write at length or in detail - ex.pa.ti.a.tion n