ANTIDISESTABLISHMENTARIANISM

FLOCCIPOCCINIHILIPILIFICATION

Pronounced: flox-ee-pox-ee-ni-hi-li-pi-li-fi-cay-shun.
According to the Guinness Book of World Records,
this is the longest word in the English language.
It means "the act of rendering as useless."

This word is one letter longer than antidisestablishmentarianism,
and contains much fewer morphemes.