from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A sociolinguistic phenomenon in which complementary social functions are distributed between a prestigious or formal variety and a common or colloquial variety of a language, as in Greek, Tamil, or Scottish English.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. the coexistence of two closely related native languages or dialects among a certain population, one of which is regarded to be more prestigious than the other; also, that of two unrelated languages
- n. the presence of a cleft or doubled tongue
from The Century Dictionary and Cyclopedia
- n. A condition of having a double tongue.
From Greek diglōssos, speaking two languages : di-, two; see di-1 + glōssa, tongue, language.(American Heritage® Dictionary of the English Language, Fourth Edition)
From the New Latin diglōssia, from the French diglossie, from the Ancient Greek δίγλωσσος (diglōssos, "bilingual") + -ία (-ia, whence the French -ie and the English -ia). (Wiktionary)