An emporium refers to a trading post, factory, or market of Classical antiquity, derived from the Ancient Greek: ἐμπόριον, translit. (empórion), which becomes Latin: emporium. The plural is emporia in both languages, although in Greek the plural undergoes a semantic shift to mean "merchandise". 
Famous emporia include Sais, where Solon went to acquire the knowledge of Egypt; Elim, where Hatshepsut kept her Red Sea fleet; Elat, where Thebes was supplied with mortuary materials, linen, bitumen, naphtha, frankincense, myrrh and carved stone amulets from Palestine, Canaan, Aram, Lebanon, Ammon, Hazor, Moab, Edom, Punt and the Arabian Peninsula from Petra to Midian; and Olbia, which exported cereals, fish and slaves.
Emporia functioned much like European trading colonies in China.
In the Hellenic and Ptolemaic realm, emporia included the various Greek, Phoenician, Egyptian and other city-states and trading posts in the circum-Mediterranean area. Among these commercial hubs were cities like Avaris and Syene in Lower Egypt, Thebes in Upper Egypt, and Opone, Elim, Elat and other Red Sea ports. For the Hittites, it encompassed Kanesh and Kadesh. For Phoenicia, it included Cádiz, Carthage, Leptis Magna, and Cyrene, among others (although Cyrene had been founded by Greeks).
Birley, Anthony. Septimius Severus: The African Emperor. pp. 1–7.