From WordNet (r) 3.0 (2006):
dilate
v 1: become wider; "His pupils were dilated" [syn: dilate,
distend]
2: add details, as to an account or idea; clarify the meaning of
and discourse in a learned way, usually in writing; "She
elaborated on the main ideas in her dissertation" [syn:
elaborate, lucubrate, expatiate, exposit, enlarge,
flesh out, expand, expound, dilate] [ant:
abbreviate, abridge, contract, cut, foreshorten,
reduce, shorten]