Emporium
late 16th century: from Latin, from Greek emporion, from emporos ‘merchant’, based on a stem meaning ‘to journey’.
wiktionary
Borrowed from Latin emporium(“trading station; business district in a city; market town”), from Ancient Greek ἐμπόριον(empórion, “factory, trading station; market”), from ἔμπορος(émporos, “merchant, trader; traveller”) + -ιον(-ion, suffix forming nouns). ἔμπορος is derived from ἐμ-(em-) (variant of ἐν-(en-, prefix meaning ‘in; within’)) + πόρος(póros, “journey; passageway”) (ultimately from Proto-Indo-European *per-(“to go through; to carry forth”)), modelled after ἐν πόρῳ(en pórōi, “at sea; en route”). [1]
Sense 4 (“the brain”) alludes to the organ as the place where many nerves or nerve impulses meet. [1]
The plural form emporia is from the Latin emporia.
etymonline
emporium (n.)
1580s, "place of trade, mart," from Latin emporium, from Greek emporion "trading place, market," from emporos "merchant," originally "traveler," from assimilated form of en "in" (see en- (2)) + poros "passage, voyage," related to peirein "to pass through," from PIE root *per- (2) "to lead, pass over."
Greek emporos in the "merchant" sense meant especially "one who trades on a large scale, usually but not necessarily by sea" [Buck], as opposed to kapelos "local retail dealer, shopkeeper." Properly, a town which serves as the commercial hub of a region, but by 1830s American English "Grandiloquently applied to a shop or store" [Craigie].
