Why Cambridge English dictionary gives two pronunciations for "teacher" and Lexico gives only one?
- /ˈtiː.tʃər/ and /ˈtiː.tʃɚ/
- Only /ˈtiːtʃə/
Does teacher have two pronunciations?
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In non-rhotic1 varieties of English (Standard Southern British English here), 'teacher' on it's own is pronounced /ˈtiː.tʃə/. However, when it's followed by another word beginning with a vowel, it's pronounced /ˈtiː.tʃər..../ i.e. the R is pronounced.
Dictionaries often write it with a parenthetical or a superscript R2 to indicate that the R is pronounced when followed by a vowel
On the other hand, /ˈtiː.tʃɚ/ is the General American English pronunciation of 'teacher'. GenAmEn is rhotic, meaning the R is pronounced in all positions.
In General American English pronunciation, the vowel /ə/ merges with the /r/ to form a single vowel called r-coloured vowel: /ɚ/.
Lexico only gives the BrEn pronunciation, while Cambridge gives both BrEn and AmEn pronunciations.