Jisho

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Wikipedia definition
1. Compensatory lengtheningCompensatory lengthening in phonology and historical linguistics is the lengthening of a vowel sound that happens upon the loss of a following consonant, usually in the syllable coda. This may be considered an extreme form of fusion, or possibly arise from speakers' attempts to preserve a word's moraic count. An example from the history of English is the lengthening of vowels that happened when the voiceless velar fricative /x/ and its palatal allophone [ç ç] were lost from the language.
Read “Compensatory lengthening” on English Wikipedia
Read “代償延長” on Japanese Wikipedia
Read “Compensatory lengthening” on DBpedia

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