Etymology
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agoraphobia (n.)

"fear of crossing open spaces," 1873, from German Agorophobie, coined 1871 by Berlin psychiatrist Carl Westphal from Greek agora "place of assembly, city market" (but here with the general sense "open space;" see agora) + -phobia "fear." Related: Agoraphobe; agoraphobic.

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Definitions of agoraphobia

agoraphobia (n.)
a morbid fear of open spaces (as fear of being caught alone in some public place);
From wordnet.princeton.edu