England
The earliest traces of a loss of /r/ in English appear in the early 15th century and occur before coronal consonants, especially … 展开

In most non-rhotic accents, if a word ending in written "r" is followed immediately by a word beginning with a vowel, the /r/ is pronounced, as in water ice. That phenomenon is referred to as " 展开

Rhotic accents include most varieties of Scottish English, Irish or Hiberno-English, Canadian English, American English, Barbadian English and Philippine English.
Non-rhotic accents include most varieties of English English, Welsh English, Australian English 展开

Some phonemic mergers are characteristic of non-rhotic accents and usually include one item that historically contained an R, which has been lost in the non-rhotic accent, and another that never did so.
/ɛə/–/ɛər/ merger 展开

Up-gliding NURSE is a diphthongized vowel sound, [əɪ], used as the pronunciation of the NURSE phoneme /ɜːr/. This up-gliding variant historically occurred in some completely non-rhotic dialects of American English and is particularly associated with the early … 展开

Certain words have spellings derived from non-rhotic dialects or renderings of foreign words through non-rhotic pronunciation. In rhotic dialects, spelling pronunciation has caused these words to be pronounced rhotically anyway. Examples include:
• Er and … 展开

• English-language vowel changes before historic /r/ 展开