The Collaborative International Dictionary of English v.0.48:

Lucubrate \Lu"cu*brate\, v. i. [imp. & p. p. Lucubrated; p.
   pr. & vb. n. Lucubrated.] [L. lucubratus, p. p. of
   lucubrare to work by lamplight, fr. lux light. See Light,
   n.]
   To study by candlelight or a lamp; to study by night.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lucubrate \Lu"cu*brate\, v. t.
   To elaborate, perfect, or compose, by night study or by
   laborious endeavor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lucubrate
    v 1: 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]