WordNet (3.0) 
(n) the family of languages that by 1000 BC were spoken throughout Europe and in parts of southwestern and southern AsiaSyn. Indo-European language, Indo-Hittite
(adj) of or relating to the Indo-European language familySyn. Indo-Germanic
(adj) of or relating to the former Indo-European peopleSyn. Aryan, Indo-AryanExample:Indo-European migrations
  Collaborative International Dictionary (GCIDE) 

a. Aryan; -- applied to the languages of India and Europe which are derived from the prehistoric Aryan language; also, pertaining to the people or nations who speak these languages; as, the Indo-European or Aryan family. [ 1913 Webster ]

The common origin of the Indo-European nations. Tylor. [ 1913 Webster ]

. A member of one of the Caucasian races of Europe or India speaking an Indo-European language.

Professor Otto Schrader . . . considers that the oldest probable domicile of the Indo-Europeans is to be sought for on the common borderland of Asia and of Europe, -- in the steppe country of southern Russia. Census of India, 1901. [ Webster 1913 Suppl. ]

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