/flok'seuh naw'seuh nuy'hil euh pil'euh fi kay"sheuhn/ , n.
Rare. the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
[ 1735-45; flocci + nauci + nihili + pili all meaning "of little or no value, trifling" + -FICATION ]