adj. Describes a word that includes one or more uppercase letters within the body of the word.
2002
Compound words like WebAddresses that include uppercase letters to separate words are also known as inner-capped or inter-capped words. This is also known as BiCapitalization and the words are known as InterCaps.
1997 (earliest)
I used to think this trend started with companies that affected computer lingo — CompuServe, DigiCash, WordPerfect, HotJava — but lexicographer Richard Weiner, who I suspect coined inner-capped on the analogy of the mafia's knee-capping, reminds me of the 1959 TelePrompTer.