Source : Webster's Revised Unabridged Dictionary (1913)

Gentile \Gen"tile\, n. [L. gentilis belonging to the same clan,
   stock, race, people, or nation; in opposition to Roman, a
   foreigner; in opposition to Jew or Christian, a heathen: cf.
   F. gentil. See {Gentle}, a.]
   One of a non-Jewish nation; one neither a Jew nor a
   Christian; a worshiper of false gods; a heathen.

   Note: The Hebrews included in the term g[=o]yim, or nations,
         all the tribes of men who had not received the true
         faith, and were not circumcised. The Christians
         translated g[=o]yim by the L. gentes, and imitated the
         Jews in giving the name gentiles to all nations who
         were neither Jews nor Christians. In civil affairs, the
         denomination was given to all nations who were not
         Romans.

   Syn: Pagan; heathen. See {Pagan}.

Gentile \Gen"tile\, a.
   1. Belonging to the nations at large, as distinguished from
      the Jews; ethnic; of pagan or heathen people.

   2. (Gram.) Denoting a race or country; as, a gentile noun or
      adjective.

Source : WordNet®

gentile
     adj : belonging to or characteristic of non-Jewish peoples
     n 1: a person who does not acknowledge your God [syn: {heathen},
          {pagan}, {infidel}]
     2: a person who is not a member of one's own religion; used in
        this sense by Mormons and Hindus
     3: in this sense `Gentile' denotes a Christian as contrasted
        with a Jew; `goy' is a derogatory word for Christians used
        by Jews [syn: {non-Jew}, {goy}]