Meaning of floccinaucinihilipilification

floc•ci•nau•ci•ni•hil•i•pil•i•fi•ca•tion

Pronunciation: (flok"su-nô"su-nī"hil-u-pil"u-fi-kā'shun), [key]
— n.
  1. the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.