1910 New Catholic Dictionary
An appellative which varies in application according to the religious and even the cultural viewpoint adopted. Thus, in the Old Testament it designates the collection of nations of non-Israelitic stock (2 Esdras 5) and alien to the worship and customs of the true religion. This meaning is carried over into the New Testament (Luke 2); at times, it is a synonym for "Greek" (Romans 2) and, in certain passages, it stands in contrast to "Christians" (1 Corinthians 5).
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Entry for 'Gentiles'. 1910 New Catholic Dictionary. https://www.studylight.org/dictionaries/eng/ncd/g/gentiles.html. 1910.