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A defective script is a writing system that does not represent all the phonemic distinctions of a language. It is different from an irregular script, which ''can'' distinguish all the phonemes of the language even if in practice it does not always do so. For example, Italian has seven vowels, but the Italian alphabet has only five vowel letters to represent them; in general, the differences between and are simply ignored, though when stress marks are used they may distinguish them. Among the consonants, both and are written , and both and are written , though not many words are distinguished by the latter. Stress and hiatus are not reliably distinguished. Such imperfections are nothing new. The Greek alphabet was defective during its early history. Classical Greek had distinctive vowel length: five short vowels, , and seven long vowels, . When the Phoenician alphabet was adapted to Greek, the names of five letters were pronounced with initial vowels by the Greeks and used acrophonically to represent vowels. These were ''alpha'', ''e'' (later called ''e psilon''), ''iota'', ''o'' (later called ''o micron''), and ''u'' (later called ''u psilon''): five letters for twelve vowel sounds. Later the () dropped from the Eastern Greek dialects, and the letter ''heta'' (now pronounced ''eta'') became available; it was used for . About the same time the Greeks created an additional letter, ''omega'', probably by writing ''omicron'' with an underline, that was used for . Digraphs ''ei'' and ''ou'' were devised for and Thus Greek entered its classical era with seven letters and two digraphs for twelve vowel sounds. Long were never distinguished from short , even though the distinction was meaningful. Although the Greek alphabet was a good match to the consonants of the language, it was defective when it came to some vowels.〔Swiggers, "Transmission of the Phoenician Script to the West"; Threatte, "The Greek Alphabet"; in Daniels & Bright, eds., 1996. ''The World's Writing Systems''.〕 A famously defective script is the Arabic one.〔Daniels & Bright, p. 561-3〕 The modern script does not normally write short vowels, but for the first few centuries of the Islamic era, long vowels were not written and many consonant letters were ambiguous as well. The Arabic script derives from the Aramaic, and not only did the Aramaic language have fewer phonemes than Arabic, but several originally distinct Aramaic letters had conflated (become indistinguishable in shape), so that in the early Arabic writings 28 consonants phonemes were represented by only 18 letters—and in the middle of words, only 15 were distinct. For example, medial represented , and represented . A system of diacritic marks, or ''pointing,'' was later developed to resolve the ambiguities, and over the centuries became nearly universal. However, even today unpointed texts of a style called ''mašq'' are found, where these consonants are not distinguished.〔Bell and Watt, 1970. ''Bell's introduction to the Qurʼān''〕 Without short vowels or geminate consonants being written, modern Arabic نظر ''(unicode:nẓr)'' could represent 'he saw', 'he compared', 'he was seen', 'he was compared', 'a glance', or 'similar'. However, in practice there is little ambiguity, as the vowels are more easily predictable in Arabic than they are in a language like English. Moreover, the defective nature of the script has its benefits: the stable shape of the root words, despite grammatical inflection, results in quicker word recognition and therefore faster reading speeds; and the lack of short vowels, the sounds which vary the most between Arabic dialects, makes texts more widely accessible to a diverse audience.〔Bauer, 1996. "Arabic Writing". In Daniels & Bright, eds, ''The World's Writing Systems''.〕 However, in ''mašq'' and those styles of ''kufic'' writing which lack consonant pointing, the ambiguities are more serious, for here different roots are written the same. ﯨطر could represent the root ''(unicode:nẓr)'' 'see' as above, but also ''(unicode:nṭr)'' 'protect', ''(unicode:bṭr)'' 'pride', ''(unicode:bẓr)'' 'clitoris' or 'with flint', as well as several inflections and derivations of each of these root words. The Arabic alphabet has been adopted by many Muslim peoples to write their languages. In them, new consonant letters have been devised for sounds lacking in Arabic (e.g. /p/, /g/, /tʃ/, and /ʒ/ in Persian;〔Daniels & Bright, p. 747〕 all the aspirate and retroflex stops in Sindhi〔Daniels & Bright, p. 757〕). But rarely have the full set of vowels been represented in those new alphabets: Ottoman Turkish had eight vowels, but used only three letters to note them.〔Daniels & Bright, p. 758〕 However, two adaptions of the Arabic alphabet do unambiguously mark all vowels: that for Kashmiri〔Daniels & Bright, p. 753〕 and that for Kurdish.〔Daniels & Bright, p. 748〕 When a defective script is written with diacritics or other conventions to indicate all phonemic distinctions, the result is called ''plene'' writing.〔Weinberg, 1985. ''The history of Hebrew plene spelling''〕 Defectiveness is a cline: the Semitic ''abjads'' do not indicate (all) vowels, but there are also alphabets which mark vowels but not tone (e.g. many African languages), or vowel quality but not vowel length (e.g. Latin). Even if English orthography were regularized, the English alphabet would still be incapable of unambiguously conveying intonation, though since this is not expected of scripts, it is not normally counted as defectiveness.〔Sampson, 1990. ''Writing Systems: A Linguistic Introduction''〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「defective script」の詳細全文を読む スポンサード リンク
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