Formation
In general, moras are formed as follows:
- A syllable onset (the first consonant or consonants of the syllable) does not represent any mora.
- The syllable nucleus represents one mora in the case of a short vowel, and two moras in the case of a long vowel or diphthong. Consonants serving as syllable nuclei also represent one mora if short and two if long. (Slovak is an example of a language that has both long and short consonantal nuclei.)
- In some languages (for example, Japanese), the coda represents one mora, and in others (for example, Irish) it does not. In English, the codas of stressed syllables represent a mora (thus, the word cat is bimoraic), but for unstressed syllables it is not clear whether the codas do so (the second syllable of the word rabbit might be monomoraic).
- In some languages, a syllable with a long vowel or diphthong in the nucleus and one or more consonants in the coda is said to be trimoraic (see pluti).
In general, monomoraic syllables are said to be light syllables, bimoraic syllables are said to be heavy syllables, and trimoraic syllables (in languages that have them) are said to be superheavy syllables. Most linguists believe that no language uses syllables containing four or more moras.
A prosodic stress system in which moraically heavy syllables are assigned stress is said to have the property of quantity sensitivity.
Read more about this topic: Quantity Sensitivity
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