linguistic:voice_change, information:filtering, structural:expansion, information:classification
Political factors

In many societies, however, a particular dialect, often the sociolect of the elite class, comes to be identified as the "standard" or "proper" version of a language by those seeking to make a social distinction and is contrasted with other varieties. As a result of this, in some contexts, the term "dialect" refers specifically to varieties with low social status. In this secondary sense of "dialect", language varieties are often called dialects rather than languages:

The status of "language" is not solely determined by linguistic criteria, but it is also the result of a historical and political development. Romansh came to be a written language, and therefore it is recognized as a language, even though it is very close to the Lombardic alpine dialects and classical Latin. An opposite example is Chinese, whose variations such as Mandarin and Cantonese are often called dialects and not languages in China, despite their mutual unintelligibility.

National boundaries sometimes make the distinction between "language" and "dialect" an issue of political importance. A group speaking a separate "language" may be seen as having a greater claim to being a separate "people", and thus to be more deserving of its own independent state, while a group speaking a "dialect" may be seen as a sub-group, part of a bigger people, which must content itself with regional autonomy.

The Yiddish linguist Max Weinreich published the expression, A shprakh iz a dialekt mit an armey un flot ("אַ שפּראַך איז אַ דיאַלעקט מיט אַן אַרמײ און פֿלאָט": " A language is a dialect with an army and navy ") in YIVO Bleter 25.1, 1945, p. 13. The significance of the political factors in any attempt at answering the question "what is a language?" is great enough to cast doubt on whether any strictly linguistic definition, without a socio-cultural approach, is possible. This is illustrated by the frequency with which the army-navy aphorism is cited.