WordWeb Online

1. State
   "exposit one's reasons"
   - set forth, expound
    
2. Add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
   "She exposited on the main ideas in her dissertation"
   - elaborate, lucubrate, expatiate, enlarge, flesh out, expand, expound, dilate

Derived forms: expositing, exposited, exposits

See also: exposition

Type of: clarify, clear up, elucidate