A language is a dialect with an army and navy

"A language is a dialect with an army and navy", sometimes called the Weinreich witticism, is a quip about the arbitrariness of the distinction between a dialect and a language. It points out the influence that social and political conditions can have over a community's perception of the status of a language or dialect. The facetious adage was popularized by the sociolinguist and Yiddish scholar Max Weinreich, who heard it from a member of the audience at one of his lectures in the 1940s.

Weinreich
This statement is usually attributed to Max Weinreich, a specialist in Yiddish linguistics, who expressed it in Yiddish: "אַ שפּראַך איז אַ דיאַלעקט מיט אַן אַרמיי און פֿלאָט a shprakh iz a dyalekt mit an armey un flot"

The earliest known published source is Weinreich's article Der YIVO un di problemen fun undzer tsayt (דער ייִוואָ און די פּראָבלעמען פֿון אונדזער צײַט "The YIVO Faces the Post-War World"; literally "The YIVO and the problems of our time"), originally presented as a speech on 5 January 1945 at the annual YIVO conference. Weinreich did not give an English version.

In the article, Weinreich presents this statement as a remark of an auditor at a lecture series given between 13 December 1943 and 12 June 1944:

In his lecture, he discusses not just linguistic, but also broader notions of "yidishkeyt" (ייִדישקייט – lit. Jewishness).

The sociolinguist and Yiddish scholar Joshua Fishman suggested that he might have been the auditor at the Weinreich lecture. However, Fishman was assuming that the exchange took place at a conference in 1967, more than twenty years later than the YIVO lecture (1945) and in any case does not fit Weinreich's description above.

Other mentions
Some scholars believe that Antoine Meillet had earlier said that a language is a dialect with an army, but there is no contemporary documentation of this.

Jean Laponce noted in 2004 that the phrase had been attributed in "la petite histoire" (essentially anecdote) to Hubert Lyautey (1854–1934) at a meeting of the Académie Française; Laponce referred to the adage as "la loi de Lyautey" ('Lyautey's law').

Randolph Quirk adapted the definition to "A language is a dialect with an army and a flag".

Antecedents
In 1589, George Puttenham had made a similar comment about the political nature of the definition of a language as opposed to a language variety: "After a speech is fully fashioned to the common understanding, and accepted by consent of a whole country and nation, it is called a language".