What is the longest common English word you can spell without repeating a letter?

What is the longest (perhaps not-so-common) English word that can be written using only Roman numerals?

In a second place tie are: "CIMICIC" and "CIMICID". 

In first place is the word that George Bush always uses to end his letters to Dick Cheney:

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Edited on July 24, 2004, 10:22 am

Posted by Penny on 2004-07-24 10:21:05