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1.
An extraordinarily large word. A word that only the pedantic use.
Pejorative is a sesquipedalian for insulting.
by John Paxton March 20, 2005
 
2.
ses·qui·pe·da·lian
n.
A long word.

adj.
1. Given to the use of long words.
2. Long and ponderous; polysyllabic.
A sesquipedalian is Throwing long word in a sentence that is un-needed:
Gregory found traffic court a Kafkaesque experience
by Chiliad May 15, 2006
 
3.
A lover of words; particularly long words. These people don't merely love these words, they lust these words, they fantasize about them, they fucking ADORE THEM!

The lives of Sesquipedalians are words, they live, breathe and eat words. Literally. Extreme Sesquipedalianism (or ES) is a condition whereby a patient reports excessive masturbation and intrusive sexual thoughts about words. Treatment is sparse.
Nick: Hey, I redecorated the bedroom with Predominantly last night.

Warren: You're such a sesquipedalian! I love Paradoxically so much I think i could cry.
by WizWaz91 February 24, 2011