Explanation
The sonority hierarchy ranks sound classes by relative resonance and their typical suitability as syllable nuclei. Vowels normally rank highest, followed—depending on the model—by glides, liquids, nasals, fricatives, and stops. The hierarchy is not a simple loudness scale: articulatory openness, acoustic energy, and phonological patterning jointly motivate the concept. Many syllables display rising sonority toward the nucleus and falling sonority after it, yet languages permit systematic exceptions. The conceptual movement uses the hierarchy as a comparative model, tests it against real sound sequences, and states precisely where language-specific constraints outweigh the general tendency.
Movement of thought
1. The segments involved are classified phonetically and placed on a working scale. 2. Syllable boundaries and nuclei are established independently of the hierarchy. 3. Sonority rise and fall in onsets and codas are tested against corpus words. 4. Exceptions are grouped by morphology, loanword status, and language-specific rules. 5. The model is evaluated as a gradient generalisation rather than an exceptionless law.
Scientific use case
Phonology, typology, acquisition research, and clinical linguistics use sonority to analyse syllable structure and repair strategies. Experiments and corpora must state the hierarchy employed and consider alternative explanations.
Example
A study ranks consonants in syllable onsets by sonority. Most combinations rise toward the vowel, while a small stable group involving particular fricatives and stops forms a clearly described exception.
Counterexample
A sound sequence is not impossible merely because it violates the expected sonority profile. If it occurs systematically in a language and speakers accept it, language-specific constraints must supplement the hierarchy.
Distinction
Distinguish sonority from loudness, voicing, and articulatory openness alone. It is a theoretical bundle used to describe phonological organisation, not one directly measurable physical variable.
Effect on thought and perception
The hierarchy predicts preferred sound sequences and some syllable boundaries and partly explains why learners simplify clusters. It draws attention to gradient structure within an apparently linear speech stream.
Resonance
Sounds gain acoustic openness as they approach the syllable nucleus and recede after it. The syllable appears as a small sound wave with an audible peak.
Cite this entry
Reich, Michael (Hrsg./ed.): „Sonority hierarchy“. Atlas der Sprache, AT-134-002. ATLAS 260, data model 1.6.0. https://atlasoflanguage.com/concept/AT-134-002The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.
Historical background
The Cours classifies sounds by articulatory aperture and relates that scale to sequencing. This is a historical predecessor to questions about syllable structure, not an interchangeable modern sonority hierarchy. The French passage does not attest the present English expression or equate articulatory and acoustic scales.
How conceptual history changes the analysis
State the scale actually used. An exception challenges the tested ordering or rule, not automatically every theory of syllables.
References for the historical section
- Ferdinand de Saussure, Cours de linguistique générale (1916), edited by Bally and Sechehaye with Riedlinger; 1971 Payot printing, Wikisource transcription · Appendix, Principles of phonology, I §3 and II §§3–5
Selected passage, not a complete genealogy or an English first-attestation claim. Original Atlas applications are editorial interpretations, not reported experiments. The Cours is a posthumous editorial reconstruction; French technical vocabulary is not an English attestation. Its historical phonology and classifications are not automatically current consensus.