5 letters · 9 points in Scrabble
noun a Greek dialect that flourished under the Roman Empire
noun a common language used by speakers of different languages
originBorrowed from Ancient Greek Κοινή (Koinḗ), from ἡ κοινὴ διάλεκτος (hē koinḕ diálektos, “the common dialect”), from κοινός (koinós, “shared, common, public, general, ordinary, usual”). Doublet of koinon.
Etymology from Wiktionary, CC BY-SA 3.0