Extrametricality
Encyclopedia
In linguistics
Linguistics
Linguistics is the scientific study of human language. Linguistics can be broadly broken into three categories or subfields of study: language form, language meaning, and language in context....

, extrametricality is a tool for prosodic analysis
Prosody (linguistics)
In linguistics, prosody is the rhythm, stress, and intonation of speech. Prosody may reflect various features of the speaker or the utterance: the emotional state of the speaker; the form of the utterance ; the presence of irony or sarcasm; emphasis, contrast, and focus; or other elements of...

 of words in a language. In certain languages, a particular segment or prosodic unit
Prosodic unit
In linguistics, a prosodic unit, often called an intonation unit or intonational phrase, is a segment of speech that occurs with a single prosodic contour...

 of a word may be ignored for the purposes of determining the stress structure of the word. For example, in a language like classical Latin
Latin
Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

, where polysyllabic words never have stress on their final syllables, and the position of stress in a word is determined by looking at the penultimate and antepenultimate syllables only, it simplifies the linguistic formulation of the stress-assignment rules of Latin to say that the final syllable of a polysyllabic word is invisible to rules which determine stress. Such invisibility is called "extrametricality" in linguistic terminology. This is purely a theoretical device — an extrametrical sound or syllable is not observed to have any special pronunciation, and extrametricality can only be determined by analyzing the prosodic patterns of the language as a whole.

Most typically, extrametricality affects one specified segment or prosodic unit (mora
Mora (linguistics)
Mora is a unit in phonology that determines syllable weight, which in some languages determines stress or timing. As with many technical linguistic terms, the definition of a mora varies. Perhaps the most succinct working definition was provided by the American linguist James D...

, syllable, etc.) at the edge of a word (usually the end). Final-segment or final-mora extrametricality can be invoked to account for the phenomenon that word-final syllables often count as "lighter" than other syllables of the same rime type
Syllable rime
In the study of phonology in linguistics, the rime or rhyme of a syllable consists of a nucleus and an optional coda. It is the part of the syllable used in poetic rhyme, and the part that is lengthened or stressed when a person elongates or stresses a word in speech.The rime is usually the...

 for purposes of determining the position of stress in a word.

According to some analyses, an example of extrametricality is found in English, in which the final consonant of every word may be analysed as extrametrical. This explains the licensing of what would otherwise be superheavy (trimoraic) syllables in English as long as they are word-final (an example of this would be any final syllable containing a long vowel or diphthong and one or more coda consonants, e.g. main /ˈmeɪn/) but the lack of certain 4-mora syllables (such as those containing a long vowel or diphthong followed by a bimoraic [ŋ]). However, other analyses of these patterns which avoid the need for extrametricality are possible: it may be posited that Weight By Position on English applies only preconsonantaly (although this leaves words ending in a long vowel and a coda cluster problematic); another analysis might propose that all English words end in a catalectic syllable, and the apparently word-final consonant(s) are parsed in the onset of this syllable.
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