Britannica Sources used in this answer

Why do some French vowel sounds have nasality?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Uncover the science behind the transformation of sounds into speech — speech Speech is the faculty of producing articulated sounds, which, when blended together, form language.

In phonetics, nasalization occurs when the soft palate (velum) is lowered, allowing the airstream to pass through both the nose and the mouth simultaneously.1

In the development of the French language, this process was triggered by the influence of a following nasal consonant on a preceding vowel. While this influence typically results in only a raising or closing effect in most Romance languages, French and Portuguese developed distinct nasal vowels where nasal resonance became a phonemic feature. This means that nasal vowels in French are not merely variants of oral vowels but are essential for distinguishing between different words, such as pin (/pɛ̃/) and paix (/pɛ/).2

Although nasalization was likely noticeable by the 10th century, it may not have become phonemic until later. By the 16th century, some denasalization occurred in French when the nasal consonant was intervocalic, leading to the retention of the n sound in feminine forms, such as the contrast between bon (/bõ/) and bonne (/bon/).2