—adj.
1 of or relating to the family of languages spoken over the greater part of Europe and Asia as far as N. India.
2 of or relating to the hypothetical parent language of this family.
—n.
1 the Indo-European family of languages.
2 the hypothetical parent language of all languages belonging to this family.
3 (usu. in pl.) a speaker of an Indo-European language.
Useful english dictionary. 2012.