Webster's English Dictionary

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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