[1] : The Collaborative International Dictionary of English v.0.48

ethnic \eth"nic\, ethnical \eth"nical\, a. l. ethnicus, gr. ?,
   fr. ? nation, ? ? the nations, heathens, gentiles: cf. f.
   ethnique.
   1. belonging to races or nations; based on distinctions of
      race; ethnological.
      1913 webster

   2. pertaining to the gentiles, or nations not converted to
      christianity; heathen; pagan; -- opposed to jewish and
      christian.
      1913 webster

   3. of or pertaining to a group having a distinct racial,
      cultural, religious or linguistic character; as, ethnic
      differences within a population can cause civil war.
      pjc

   4. being a member of a distinct racial or cultural minority
      within a larger population; as, ethnic chinese own most of
      the businesses in indonesia.
      pjc
see also:
jewish christian 

[2] : The Collaborative International Dictionary of English v.0.48

ethnic \eth"nic\n.
   1. a heathen; a pagan. obs.
      1913 webster

            no better reported than impure ethnic and lay dogs.
                                                  --milton.
      1913 webster

   2. a member of an ethnic group.
      pjc

[3] : WordNet (r) 2.0

ethnic
     adj 1: denoting or deriving from or distinctive of the ways of
            living built up by a group of people; "influenced by
            ethnic and cultural ties"- j.f.kennedy; "ethnic food"
            syn: cultural, ethnical
     2: not acknowledging the god of christianity and judaism and
        islam syn: heathen, heathenish, pagan
see also:
cultural ethnical heathen heathenish pagan 

Ethnic >> E Words
Ethnic, definition of term: Ethnic
ethnic_pag1.html

Ethnic Group >> E Words
Ethnic Group, definition of term: Ethnic Group
ethnic+group_pag1.html