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Quantitative metathesis (or transfer of quantity)〔Smyth, ''Greek Grammar'', (paragraph 34 ) on CCEL: transfer of quantity〕 is a specific form of ''metathesis'' or ''transposition'' (a sound change) involving ''quantity'' or vowel length. By this process, two vowels near each other – one long, one short – switch their lengths, so that the long one becomes short, and the short one becomes long. In theory, the definition includes both :long-short → short-long and :short-long → long-short, but Ancient Greek, which the term was originally created to describe, displays only the former, since the process is part of long-vowel shortening. ==Ancient Greek== In the Attic and Ionic dialects of Ancient Greek, ''ēo'' and ''ēa'' often exchange length, becoming ''eō'' and ''eā''.〔 This quantitative metathesis is more accurately described as one form of long-vowel shortening. Usually if quantitative metathesis affects a word, other kinds of shortening do as well, in the forms where quantitative metathesis cannot occur: * ''ēwo'' → ''eō'' (quantitative metathesis) * ''ēws'' → ''ews'' (shortening of long diphthong before consonant) * ''ēi'' → ''ei'' (analogical shortening) In general, the vowels affected by this shortening were separated by the Proto-Indo-European semivocalic versions of ''u'' or ''i'', usually deleted in later Greek: ''w'' (written ϝ or υ̯ ) or ''y'' (written ι̯ ). 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「Quantitative metathesis」の詳細全文を読む スポンサード リンク
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