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| 3292645544 | Backward reconstruction | The tracking of sound shifts and hardening of consonants in reverse toward the original language | 0 | |
| 3292645545 | Conquest theory | One major theory of how Proto-Indo-European diffused into Europe which holds that the early speakers of Proto-Indo-European spread westward on horseback, overpowering earlier inhabitants and beginning the diffusion and differentiation of Indo-European tongues | 1 | |
| 3292645546 | Creole language | A language that began as a pidgin language but was later adopted as the mother tongue by a people in place of the mother tongue | 2 | |
| 3292645547 | Deep Reconstruction | Technique using the vocabulary of an extinct language to re-create the language that proceeded the extinct language | 3 | |
| 3292645548 | Dialect chains | A set of contiguous dialects in which the dialects nearest to each other at any place in the chain are most closely related | 4 | |
| 3292645549 | Dialects | Local or regional characteristics of a language. In addition to pronunciation variation, had distinct grammar and vocabulary | 5 | |
| 3292645550 | Dispersal hypothesis | Holds that the Indo-European languages that arose from Proto-Indo-European were first carried eastward into Southwest Asia, next around the Caspian Sea, and then across the Russian-Ukrainian plains and on into the Balkans | 6 | |
| 3292645551 | Extinct Language | Language without any native speakers | 7 | |
| 3292645552 | Germanic languages | Languages (English, Danish, Norwegian, and Swedish) that reflect the expansion of peoples out of Northern Europe to the west and south | 8 | |
| 3292645553 | Global language | The language used most commonly around the world; defined on the basis of either the number of speakers of the language, or prevalence of use in commerce and trade | 9 | |
| 3292645554 | Isogloss | A geographic boundary within which a particular linguistic feature occurs | 10 | |
| 3292645555 | Language | A set of sounds, combination of sounds, and symbols that are used for communication | 11 | |
| 3292645556 | Language convergence | The collapsing of two languages into one resulting from the consistent spatial interaction of peoples with different languages | 12 | |
| 3292645557 | Language divergence | New languages are formed when a language breaks into dialects due to a lack of spatial interaction among speakers of the language and continued isolation eventually causes the division of the language into discrete new languages | 13 | |
| 3292645558 | Language families | Group of languages with a shared but fairly distant origin | 14 | |
| 3292645559 | Lingua franca | A "common language", a language used among speakers of different languages for the purpose of trade and commerce | 15 | |
| 3292645560 | Monolingual states | Countries in which only one language is spoken | 16 | |
| 3292645561 | Multilingual states | Countries in which more than one language is spoken | 17 | |
| 3292645562 | Mutual intelligibility | The ability of two people to understand each other when speaking | 18 | |
| 3292645563 | Nostratic | Language believed to be the ancestral Language not only of Proto-Indo-European, but also of the Kartvelian languages of the southern Caucasus region, the Uralic-Altaic languages (including Hungarian, Finnish, Turkish, and Mongolian), the Dravadian languages of India, as the Afro-Asiatic language family | 19 | |
| 3292645564 | Official Language | In multilingual countries the language selected, often by the educated and politically powerful elite, to promote internal cohesion; usually the language of the courts and government | 20 | |
| 3292645565 | Pidgin language | When parts of two or more languages are combined in a simplified structure and vocabulary | 21 | |
| 3292645566 | Proto-Indo-European | Linguistic hypothesis proposing the existence of an ancestral Indo-European language that is the hearth of the ancient Latin, Greek, and Sanskrit languages which hearth would link modern languages from Scandinavia to North Africa and from North America through parts of Asia to Australia | 22 | |
| 3292645567 | Renfrew hypothesis | Proposed that three areas in and near the first agricultural hearth, the Fertile Crescent, gave rise to three language families: Europe's Indo-European languages; North African and Arabian languages; and then languages in present-day Iran, Afghanistan, Pakistan, and India | 23 | |
| 3292645568 | Romance languages | Languages (French, Spanish, Italian, Romanian, and Portuguese) that lie in the areas that were once controlled by the Roman Empire but we're not subsequently overwhelmed | 24 | |
| 3292645569 | Slavic languages | Languages (Russian, Polish, Czech, Slovak, Ukrainian, Slovenian, Serbo-Croatian, and Bulgarian) that developed as Slavic people migrated from a base in present-day Ukraine close to 2000 years ago | 25 | |
| 3292645570 | Sound Shift | Slight change in a word across languages within a subfamily or through a language family from the present backward toward its origin | 26 | |
| 3292645571 | Standard language | The variant of a language that a country's political and intellectual elite seek to promote as the norm for use in schools, government, the media, and other aspects of public life | 27 | |
| 3292645572 | Subfamilies | Divisions within a language family where the commonalities are more definite and the origin is more recent | 28 | |
| 3292645573 | Toponyms | Place names | 29 |
