Lucubration \loo-kyoo-BRAY-shun\ or \loo-kuh-BRAY-shun\ , noun;
1. The act of studying by candlelight; nocturnal study; meditation
2. That which is composed by night; that which is produced by meditation in retirement; hence (loosely) any literary composition
This word, with the definition of "literary work showing signs of too-careful elaboration", dates to the 1590's and comes from Latin lucubrationem, the nominative of lucubraio ("nocturnal study, night work"). Lucubario derives from lucubratus, the past participle of lucubrare which is literally "to work by artificial light" from the stem lucere ("to shine").
My mind has been blown. I saw this word and immediately thought of the word lucubrious from the song 'I'll Do Anything' by Jason Mraz. I tried to look it up and first off, it's spelled lacubrious. Second, it's made up! No wonder I never knew what that meant!
Today's word and the first definition were both taken from Dictionary.com's 'Word of the Day' for Saturday, February 19
Etymologies come from the Oxford English Dictionary and/or Etymonline.com