A Greek word used in the New Testament (Romans 1:14) to denote one of another nation. In Colossians 3:11, the word more definitely designates those nations of the Roman empire that did not speak Greek. In 1 Corinthians 14:11, it simply refers to one speaking a different language. The inhabitants of Malta are so called (Acts 28:1,2,4). They were originally a Carthaginian colony. This word nowhere in Scripture bears the meaning it does in modern times.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain, copy freely.
Easton, Matthew George. "Entry for 'Barbarian'". "Easton's Bible Dictionary".