Where does a dialect end and a language begin?
We often assume languages are distinct islands, but they actually exist on a spectrum. From the shared grammar of Dutch and Afrikaans to the vast, unintelligible gaps in Chinese, the line between 'speaking a dialect' and 'speaking a language' is often more political than linguistic.
In linguistics, mutual intelligibility describes the ability of speakers of different varieties to understand one another without prior study. This relationship is rarely a simple binary; it exists on a spectrum of partial, significant, or even non-existent understanding. In some cases, this connection is asymmetric. For instance, Dutch speakers can often understand Afrikaans more easily than the reverse, largely because Afrikaans features a simplified grammar. Similarly, while Norwegian and Danish share deep historical ties due to past Danish rule, the relationship remains one-sided because Norwegian has assimilated significant Danish vocabulary.
The concept of a 'dialect continuum' further complicates the boundary. In such a system, neighboring varieties are mutually intelligible, but differences accumulate over distance. This can lead to scenarios where the two furthest points in a chain—such as certain Scandinavian varieties—share almost no common understanding. Interestingly, the disappearance of middle varieties in a continuum can cause once-connected ends to be reclassified as entirely separate languages, even if no linguistic change occurred during the extinction of the intermediate links.
However, politics often overrides linguistics. The varieties of Chinese are frequently classified as a single language despite a lack of mutual intelligorbility between distant regions. The same applies to Arabic, which maintains a shared prestige variety in Modern Standard Arabic. Conversely, North Germanic languages like Danish, Swedish, and Norwegian are classified as separate languages because they possess distinct standard forms, even though they maintain significant levels of intelligibility. Ultimately, while some linguists argue that the gradual nature of these shifts makes boundaries arbitrary, a 2021 study suggests that mutual intelligibility can indeed allow for meaningful segmentation.
Source: Mutual intelligibility
