The correct spelling of the phrase is "most emerita". "Emerita" is a Latin word meaning "retired female professor" or "honorary female professor". The pronunciation is /ˈiːmərɪtə/, with the emphasis on the second syllable. The "e" in the second syllable is pronounced like the "e" in "bet". The final "a" is pronounced like the "a" in "ago". The word "most" is pronounced as /moʊst/, with the emphasis on the first syllable.
The term "emerita" refers to a woman who has retired or been relieved from professional duties or a particular position. It is the feminine form of "emeritus", which is the Latin word for "retired" or "honorary".
The word "emeritus" itself comes from the Latin phrase "emerere", meaning "to earn out" or "to serve out". In ancient Rome, this term was used to describe soldiers who had served their time and were granted an honorable discharge. Over time, it started to be used in academia to refer to retired professors who had made significant contributions to their field.
The addition of "most" before "emerita" is not a standard part of the word's etymology. It is possible that the term "most emerita" is being used for emphasis or to highlight a particularly notable or exceptional retired woman.