Noun
(phonology, dialectology) The phenomenon in some dialects of English, especially Canadian English, in which /aɪ/ is realized as [ʌɪ] and/or /aʊ/ is realized as [ʌʊ] or [ɛʊ] before underlying unvoiced consonants.
(phonology, dialectology) A similar but more restricted phenomenon, found in most dialects of American English, that applies only to /aɪ/, which is realized as [ʌɪ] in certain contexts, especially before underlying unvoiced consonants but with significant speaker-to-speaker variation.
Source: en.wiktionary.orgDescription main Phonetic environment In general, Canadian raising affects vowels before voiceless consonants like main, main, main, and main. Source: Internet
As with Canadian raising, the relative advancement of the raised nucleus is a regional indicator. Source: Internet
Especially in parts of the Atlantic provinces, some Canadians do not possess the phenomenon of Canadian raising. Source: Internet
On the other hand, certain non-Canadian accents demonstrate Canadian raising. Source: Internet
Prairies (Manitoba, Saskatchewan and Alberta) A strong Canadian raising exists in the prairie regions together with certain older usages such as chesterfield and front room also associated with the Maritimes. Source: Internet