emeritus
Emeritus (adjective) means Retired from a post, especially a university professorship, but allowed to keep the title as an honour. Example: “She is professor emeritus of astrophysics at Edinburgh.”
How to use emeritus
Learner’s notesIn plain EnglishRetired but still allowed to use the job title as an honour.
Formal, chiefly academic, religious and institutional.
The plural is emeriti; "emeritus" is not usually applied to someone who left a post before retirement age.
Trace the full origin ↓Fill the gap
Can you complete this real example?
She is professor _____ of astrophysics at Edinburgh.
Etymology
From Latin emeritus "having completed one's service", originally used of a soldier who had served his full term.