From BiblePortal Wikipedia

Watson's Biblical & Theological Dictionary [1]

Heathens, and particularly those who worship idols. The term came into use after the establishment of Christianity, the cities and great towns affording the first converts. The Heathens were called Pagans, from pagus, "a village," because they were then found chiefly in remote country places; but we use the term commonly for all who do not receive the Jewish, Christian, or Mohammedan religions.

Holman Bible Dictionary [2]

ethnoi   1 Corinthians 5:1 1 Corinthians 10:20GentilesPagan Gods