expatiate

expatiate

[ik-spey-shee-eyt]
verb (used without object), expatiated, expatiating.
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.

Origin:
1530–40; < Latin expatiātus past participle of ex(s)patiārī to wander, digress, equivalent to ex- ex-1 + spatiārī to walk about, derivative of spatium space; see -ate1

expatiation, noun
expatiator, noun
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World English Dictionary
expatiate (ɪkˈspeɪʃɪˌeɪt)
 
vb (foll by on or upon)
1.  to enlarge (on a theme, topic, etc) at length or in detail; elaborate (on)
2.  rare to wander about
 
[C16: from Latin exspatiārī to digress, from spatiārī to walk about]
 
expati'ation
 
n
 
ex'patiator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

expatiate
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.
Online Etymology Dictionary, © 2010 Douglas Harper
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