Why languages never stop changing, even when we try to freeze them in writing.

Cultures · Published 30 September 2026 Swipe more like this →

In short: Languages are in constant flux, shifting their sounds across time and space. While we often view these changes as random, historical linguists have identified patterns that govern how speech evolves. From the loss of syllables to the strengthening of consonants, these shifts are inevitable, regardless of writing or media.

Historical linguistics treats sound change as a diachronic process, where a language's underlying sound system shifts over time. Unlike synchronic alternations—such as the varying pronunciation of the plural 's' in English depending on the preceding sound—true sound changes alter the phonological system itself. These shifts are often described as 'sound laws,' a term coined by 19th-century Neogrammarians who sought to apply the regularity of physical laws to language. While modern linguists view these laws as guidelines rather than inviolable rules, the assumption of regularity remains a powerful heuristic for reconstructing language history.

The traditional Neogrammarian model posits that sound change is exceptionless: if a condition for change exists, it should apply to every word in the lexicon. However, this view is contested by the theory of lexical diffusion, which suggests that changes may spread gradually through the vocabulary. Regardless of the mechanism, sound change is constrained by phonological environments rather than grammar or word meaning. For instance, a change might occur only in unstressed syllables or at specific word boundaries. Because these changes have no 'memory,' they cannot discriminate between the original sources of a sound once a merger has occurred.

Linguists categorize these shifts based on their nature or result. Assimilation, such as the Latin prefix *kom- becoming 'con-' before certain consonants, is typically a regular, exceptionless process. Conversely, dissimilation—where sounds become less alike—is often sporadic, though it can manifest as a systematic law, like Grassmann's Law in Sanskrit and Greek. Other processes include lenition (weakening), fortition (strengthening), and various forms of deletion like syncope or apocope. Whether through the addition of sounds via epenthesis or the creation of new pitch contours through tonogenesis, these processes ensure that no language remains static, proving that writing and media are ultimately powerless to halt the relentless evolution of human speech.

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