Liaison

Definition:

Liaison (from French lier, to link/bind) is a phonological process, most famously and elaborately developed in French, in which a normally silent word-final consonant is pronounced when the immediately following word begins with a vowel or aspirate-h sound. Liaison connects the two words into a single phonological unit. It is one of the defining features of French connected speech, is obligatory in some contexts, optional in others, and forbidden in yet others — making it one of the most challenging phonological phenomena for French language learners.

How Liaison Works in French

In French, most word-final consonants are silent in isolation or before consonant-initial words:

• les [le] — the definite plural article — final /z/ is silent
• But before a vowel-initial word, the /z/ is realized: les enfants [lezɑ̃fɑ̃] — “the children”

The final consonant appears as if it has been borrowed by the following word, creating a resyllabification:

• The /z/ of les surfaces as the onset of the following syllable: [le-zɑ̃-fɑ̃]

Types of Liaison in French

Obligatory Liaison Contexts

Liaison is obligatory between:

• Determiner/article + noun: les amis [lezami], un enfant [ɛ̃nɑ̃fɑ̃]
• Personal pronoun + verb: nous avons [nu-zavɔ̃], ils ont [il-zɔ̃]
• Adjective + noun (prenominal): bon après-midi (no liaison here — adjective is post-nominal in this phrase); petit ami [p?ti-t?ami]
• Monosyllabic prepositions: en élève [?~n?el?v], dans une [d?~z?yn]

Forbidden Liaison Contexts

• After et (and): toi et elle — no liaison between et and elle
• After h aspiré (aspirate h): les haricots [le a?iko] — NO liaison (aspirate h blocks liaison)
• After certain words like oui, onze

H Aspiré vs. H Muet

A particularly complex aspect of French liaison: h is silent in all French words, but words beginning with h muet (mute h) behave as if they begin with a vowel (liaison occurs), while words beginning with h aspiré (aspirate h) — a historical feature creating a “consonant-like” boundary — block liaison:

• h muet: les hommes [lezɔm] — liaison occurs
• h aspiré: les haricots [le a?iko] — liaison blocked

There is no phonetic difference today; learners must memorize which words have h aspiré.

Liaison in Other Languages

While most famous in French, liaison-type processes appear in other languages:

• English connecting /r/: in non-rhotic accents (British RP), a connecting /r/ appears before vowels: far away [fɑːr əweɪ]; butter and [ˈbʌtər ænd]
• German: doesn’t technically have liaison but has similar phrasal sandhi processes

History

Liaison developed in French through the gradual loss of word-final consonants in spoken French. Originally, most consonants were pronounced; liaison represents the frozen remnant of the earlier final consonants, preserved before vowels. The modern distribution of obligatory/optional/forbidden liaisons reflects the social and historical stratification of French pronunciation over centuries.

Common Misconceptions

• “H is pronounced in French h aspiré words” — No; aspirate h is phonetically silent; it is a lexical marking that prevents liaison and elision, not an actual sound
• “Liaison means all consonants link before vowels” — Only specific word-final consonants link (-s, -z, -x, -t, -d, -n, -p, -r, -g) in specific contexts; not all final consonants trigger liaison

Criticisms

• The obligatory/optional/forbidden classification varies somewhat between grammatical descriptions; the “optional” middle ground makes analysis complex
• French liaison acquisition is complex even for native speaker children; L2 learner acquisition follows a long developmental path

Social Media Sentiment

French learners widely discuss liaison as one of the most rule-bound yet confusing aspects of French pronunciation. The h aspiré/muet distinction is particularly notorious. Last updated: 2026-04

Practical Application

• Prioritize obligatory liaison first — these are errors if missed
• Make a list of h aspiré words you encounter (les haricots, les héros, etc.) — they must be memorized
• Extensive French listening (films, podcasts, native conversations) helps internalize liaison patterns through implicit learning

Related Terms

• Assimilation
• Elision
• Connected Speech
• Phonology

See Also

• Sakubo

Research

• Encrevé, P. (1988). La liaison avec et sans enchaînement: Phonologie tridimensionnelle et usages du français. Seuil. — Definitive sociolinguistic study of French liaison variation.
• De Jong, D. (1994). La sociophonologie de la liaison orléanaise. French Language Studies, 4(1), 39–66. — Regional liaison patterns.
• Tranel, B. (1981). Concreteness in Generative Phonology: Evidence from French. University of California Press. — Phonological analysis of French liaison.