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Sound change and alternation

In phonology and historical linguistics, cluster reduction is the simplification of consonant clusters in certain environments or over time.

In some dialects of English such as AAVE certain historical consonant clusters reduce to single consonants at the ends of words: friend rhymes with Ben, and cold is homophonous with coal. In both cases, a historical cluster of homorganic consonants loses a stop: /ˈfrɛn/, /ˈkoʊl/ However, in colder, where the consonant cluster falls between vowels, the /d/ remains: /ˈkoʊldɚ/. The similar word-final reduction of */mb/ to /m/ and */ŋɡ/ to /ŋ/ is complete in standard English (e.g. lamb, long), as it is in many other Germanic languages (e.g. Swedish lamm, lång).

Italian is well known to have undergone cluster reduction, where stop clusters have become geminates. For example, Victoria has become Vittoria. In other words, articulation but not length has reduced. A similar occurrence is observed in Portuguese as well, but gemination is absent. Cluster reduction also takes place in Catalan, and in a similar way as it happens in English. Certain consonant clusters placed at the end of a word are reduced: cent /sen/ instead of /sent/, although they recover the reduced consonant when the cluster falls between vowels: centenar /səntəˈna/. This phenomenon does not exist in Valencian, though: cent /sent/ and centenar /senteˈnaɾ/.


  • Crowley, Terry. (1997) An Introduction to Historical Linguistics. 3rd edition. Oxford University Press.

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Phonological processes: Cluster reduction and reduplication

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Cluster Reduction

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2 news items


Fri, 12 Sep 2014 13:13:21 -0700

In Philly (as in New York) locals might be prone, for instance, to pronouncing the word “human” as “YOO-men”—the result of what linguists refer to as an hj-cluster reduction (in layman terms, h-dropping). Meanwhile, the word “water” bears a unique ...
ADVANCE for Speech-Language Pathologists and Audiologists (blog)
Tue, 15 Jun 2010 08:17:24 -0700

If a child continues to demonstrate such cluster reduction, he or she may have a phonological process disorder". In addition, ASHA provides the following information as a resource for those affected by a phonological disorder(s) and in need of ...

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