DEFINITIONS:

 

(http://dictionary.reference.com/)

Uniformity: The state or quality of being uniform; overall sameness, homogeneity, or regularity: uniformity of style.

Variability: having much variation or diversity.

 

UNATTESTED: (http://www.oxfordreference.com/views/ENTRY.html?subview=Main&entry=t183.e82417)

→ adj. not existing in any documented form: if a will contains unattested changes, the changes will be disregarded although large masonry instruments were not unattested in the world, they were constructed infrequently.

• (Linguistics) denoting a form or usage or pronunciation of a word for which there is no evidence: logically possible but unattested word-formation.

 

INTERLANGUAGE: (http://www.oxfordreference.com/views/ENTRY.html?subview=Main&entry=t140.e38920)

→ noun

a language or form of language having features of two others, typically a pidgin or a version produced by a foreign learner.

INDO-EUROPEAN: (http://dictionary.reference.com/browse/indo-european)

A large, widespread family of languages, the surviving branches of which include Italic, Slavic, Baltic, Hellenic, Celtic, Germanic, and Indo-Iranian, spoken by about half the world's population: English, Spanish, German, Latin, Greek, Russian, Albanian, Lithuanian, Armenian, Persian, Hindi, and Hittite are all Indo-European languages. Compare family (def. 14).

 

Proto-Indo-European : ( http://dictionary.reference.com/search?q=Proto-Indo-European&db=luna)

The unattested prehistoric parent language of the Indo-European languages; Indo-European.