[lu.cu.bra.tion] n [L lucubration-, lucubratio study by night, work produced at night, fr. lucubrare to work by lamplight; akin to L luc-, lux] (1595): laborious or intensive study; also: the product of such study--usu. used in pl.
LUCUBRATION
Meaning of LUCUBRATION in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012