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expanse (n.)

"spatial extension; an uninterrupted stretch or area, especially one of considerable extent," 1660s, from Latin expansum, noun use of neuter of expansus, past participle of expandere "to spread out, unfold, expand," from ex "out" (see ex-) + pandere "to spread, stretch" (from nasalized form of PIE root *pete- "to spread").

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Definitions of expanse from WordNet

expanse (n.)
a wide scope;
Synonyms: sweep
expanse (n.)
the extent of a 2-dimensional surface enclosed within a boundary;
Synonyms: area / surface area
expanse (n.)
a wide and open space or area as of surface or land or sky;
From wordnet.princeton.edu