ex·panse

[ik-spans]
noun
1.
an uninterrupted space or area; a wide extent of anything: an expanse of water.
2.
something that is spread out, especially over a relatively large area: that great expanse, the sky.
3.
expansion; extension: the wide expanse of scientific knowledge.

Origin:
1660–70; < Neo-Latin expānsum, noun use of neuter of Latin expānsus, past participle of expandere to expand


1. sweep, reach, range, stretch.
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World English Dictionary
expanse (ɪkˈspæns) [Click for IPA pronunciation guide]
 
n
1.  an uninterrupted surface of something that spreads or extends, esp over a wide area; stretch: an expanse of water
2.  expansion or extension
 
[C17: from New Latin expansum the heavens, from Latin expansus spread out, from expandere to expand]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Expanse is always a great word to know.
So is interrobang. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Etymonline
Word Origin & History

expanse
1660s, from L. expansum, neut. of expansus, pp. of expandere (see expand).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In the vast expanse of space, nothing matters more than speed.
Never before had a large, populated expanse of private land been converted into
  a national park.
Water once ran through large segments of this expanse.
The vast expanse of land, water, and air surrounding the plant is still laced
  with lethal levels of radioactive contaminants.
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