New Vocabulary

I had to laugh this morning. I overheard Josh telling his older brother (who is home from work for the week because of a bad case of strep throat) about our Word of the Day Study. The study has been modified to Word of the Week. Josh and I are having great fun with it and keep seeing words we have studied pop up in our things we are reading. These are words such as ineffable, dubiety, sussuration etc. He then proceeded to tell him about an "adventure" he had last night when he couldn't get to sleep. He came out to the front room and grabbed the dictionary. Taking it back to bed with him he proceeded to look up words for the fun of it. He came across what he now says is the "coolest word ever"!

Utilitarianism: noun
1. The belief that good and evil should be measured by usefulness of actions in contributing to human happiness and welfare.

According to him it is the "coolest word ever" because it is interesting. Hmmm... I forsee "interesting" discussions on this :)

So what is your "coolest word ever"?