emeritus
adjective
[ ɪˈmɛrɪtəs ]
• (of the former holder of an office, especially a university professor) having retired but allowed to retain their title as an honour.
• "emeritus professor of microbiology"
Origin:
mid 18th century: from Latin, past participle of emereri ‘earn one's discharge by service’, from e- (variant of ex- ) ‘out of, from’ + mereri ‘earn’.
