Ionbin - Ionbin

Japanese: イ音便 - いおんびん

〘noun〙 A type of sound change. For the sake of pronunciation, the consonants k, g, and s of "ki," "gi," and "shi" are dropped, mainly at the end of conjugated words, to become the "i" sound. This is the same as "kaite" becoming "kaite," "tsugigite" becoming "tsugi," "koroshite" becoming "koroshite," "atsuki" becoming "atsui," and " kisaki " becoming "kisai." In rare cases, it can also be seen with the sounds of r and t, as in "gozaimasu" becoming "gozaimasu" and "tatematsuru" becoming "taimatsuru." It first appeared in the early Heian period and has become more common since then. The modern adjective "━i" originates from the i sound change of the attributive form of the adjective "━ki" in literary Japanese. Also, the conjunctive form of the sa-row 4th row verbs does not become i sound change in modern common Japanese. ※Japanese Language Studies (1891)〈Sekine Masanao〉Ongaku "These sound changes are roughly divided into four types. First, I sound changes〈abbreviated〉Second, U sound changes" [Glossary] Sound changes have already been explained in Motoori Norinaga's "Thoughts on the Three Sounds of Kanji", but it includes cases such as "I and I sound changes" such as "shiika" for "shiika", "shiji" for "shiji", and "keishi" for "keishi". The term "I sound changes" became widespread in the latter half of the Meiji period.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙音便の一つ。発音の便宜のために、おもに活用語末などの、「き」「ぎ」「し」の子音ｋ・ｇ・ｓが脱落して、「イ」の音になる現象。「書きて」が「書いて」に、「次ぎて」が「次いで」に、「殺して」が「殺いて」に、「熱き」が「熱い」に、「后(きさき)」が「きさい」になる類。まれには「ござります」が「ございます」に、「たてまつる」が「たいまつる」になるように、ｒ・ｔの音にも見られる。平安時代初期に発生し、以後多くなった。現代語の形容詞「━い」は文語の形容詞の連体形「━き」のイ音便がもと。また、サ行四段の動詞の連用形は現代の共通語ではイ音便にならない。※国語学（1891）〈関根正直〉音格「是れらの音便を、大別して四種とす。第一伊音便〈略〉第二宇音便」[語誌]音便についてはすでに本居宣長の「漢字三音考」に説かれているが、「イと云音便」とし、「詩歌」を「しいか」、「四時」を「しいじ」、「家司」を「けいし」というような場合も含めている。「イ音便」という語は明治後半から広まったもの。

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