Emeritus is used with a professional title to indicate that the person bearing it has retired but keeps the title as an honour.
例句
...emeritus professor of physics...荣誉退休的物理学教授He will continue as chairman emeritus.他将继续担任荣誉主席。
英英词典释义
Adjective
1. honorably retired from assigned duties and retaining your title along with the additional title `emeritus' as in `professor emeritus'; `retired from assigned duties' need not imply that one is inactive