0 the act of considering something to be not at all important or useful - used mainly as an example of a very long word:
Senator Jesse Helms used the delightful word "floccinaucinihilipilification".
I used floccinaucinihilipilification in an essay once and the teacher wrote in the margin "I'm not giving you extra marks for this."
The word "floccinaucinihilipilification" means "the estimation of something as worthless". It's an 18th-century coinage that combines four Latin prefixes meaning "nothing".
