Word of the day: expatiate

The word of the day is expatiate:

1. to enlarge in discourse or writing; be copious in description or discussion:to expatiate upon a theme.
2. Archaic. to move or wander about intellectually, imaginatively, etc., without restraint.

1530s, "walk about, roam freely," from L. expatiatus, exspatiatus, pp. of expatiari, exspatiari "wander, digress," from ex- "out" + spatiari "to walk, spread out," from spatium (see space). Meaning "talk or write at length" is 1610s.

(http://dictionary.reference.com/browse/expatiate)

"When the baron expatiated upon the superior practices of Europe, the Indians were baffled."

 - Charles Mann, 1491: New Revelations of the Americas Before Columbus