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Definition of Compensatory lengthening
1. Noun. (linguistics) The lengthening of a vowel sound which occurs when a following consonant is lost, an extreme form of fusion exhibited for example by many non-rhotic British dialects of English, which drop the /?/ from /??t/ but compensatorily lengthen the /?/, resulting in /??t/ ("art"). ¹
¹ Source: wiktionary.com