ATLAS OF LANGUAGE

AT-091-012 · ATLAS 260

Hiatus

The meeting of two vowels at a syllable or word boundary without merging.

Part of the subject path Sound, Phonetics and Phonology

Why is this entry in the Atlas?

A · Analytical concept R1 · Distinct contribution to understanding

Hiatus examines a retained boundary between vowel nuclei. It complements diphthong and fusion processes by testing whether separate nuclei are realised and how that separation shapes rhythm.

Colours and admission grounds

The rectangular label identifies the entry function: F – linguistic figure or procedure; A – analytical concept; G – foundational concept; E – selected concrete case. The rounded badge indicates the admission ground: R1 – distinctive contribution; R2 – necessary foundation; R3 – justified illustrative case. This editorial rationale explains the current selection rather than claiming an undocumented original selection history.

Explanation

Hiatus is the immediate meeting of two vowels across a syllable or word boundary without their fusion into a single sound. It makes a boundary audible and articulatorily tangible: speakers may realise both vowels separately, insert a glide, delete one vowel, or contract the sequence. The solution depends on language, speech rate, register, prosody, and metre. Poetry and rhetoric may avoid hiatus as roughness or deliberately use it as interruption. The concept thus shows two open movements of sound meeting while linguistic systems negotiate between preservation of the boundary and fluent transition.

Movement of thought

1. Two vocalic units first come into immediate contact at a syllable or word boundary. 2. Articulation must mediate among separate realisation, a gliding transition, deletion, or contraction. 3. Linguistic convention, rhythm, and speaking situation determine whether the boundary remains audible or is smoothed. 4. A counter-test examines syllable structure and actual pronunciation rather than merely counting adjacent vowel letters. 5. The sequence returns as a shaped threshold where separation and continuity are negotiated in sound.

Scientific use case

Phonetics and phonology can measure duration, formants, glottalisation, and syllable boundaries. Corpus and metrical studies compare language-specific repair strategies and rhythmic uses of deliberately retained vowel contact.

Example

In a slow reading, the vowels at the boundary in “the open atlas” may be carefully separated; faster speech can weaken the audible edge through a gliding transition.

Counterexample

Two vowel letters occur together in writing but form a diphthong or one sound. Without separate vocalic nuclei, there is no hiatus in the phonological sense.

Distinction

Distinguish hiatus from diphthong, synizesis, elision, and mere orthographic vowel sequence. Separate vocalic nuclei and their phonological or phonetic realisation are decisive.

Effect on thought and perception

Hiatus can foreground a boundary, delay rhythm, and draw attention to sound, whereas its smoothing supports articulatory and prosodic continuity.

Resonance

Two vowels meet as open spaces of sound; the voice determines whether a threshold remains audible between them or a transition emerges.

Cite this entry

Reich, Michael (Hrsg./ed.): „Hiatus“. Atlas der Sprache, AT-091-012. ATLAS 260, data model 1.6.0. https://atlasoflanguage.com/concept/AT-091-012

https://atlasoflanguage.com/concept/AT-091-012

The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.

Historical background

In the Cours, hiatus belongs to the problem of how a sequence is divided into syllabic events. The discussion of French formations such as ouvrier shows why adding a syllable and inserting a consonantal transition are not identical descriptions. The editors explicitly distinguish variants with and without hiatus. This is a historical analysis of articulation and syllabification, not a rule that any adjacent written vowels constitute a gap. For the Atlas, one can first compare the sequence of letters, then the sequence of vowel qualities, and finally the number of syllabic nuclei. Those observations may give different answers. The witness makes that change of analytical level visible while leaving the modern experimental description and the English borrowing history unresolved. Its phonetic notation requires interpretation rather than direct copying.

How conceptual history changes the analysis

Hiatus is defined by separate syllabic vowel nuclei, not by spelling alone; vowel adjacency, transitional consonants, and syllable count must be tested separately.

References for the historical section

Historical source evidence and Atlas applications remain separate; this import does not assert new first attestations or a fresh exhaustive source verification.