The technical definition of "anime" is the french term that means anything animated. But of course, the term
has come to mean almost exclusively the specific artform from Japan.
I would not consider American cartoons as anime. Though recently there have been many shows that indicate a strong anime
influence, like teen titans. but all of these shows are as have been said aimed at the 5-10 ish age group. An american
cartoon often targets ONLY boys and ONLY girls. Anime on the other hand, attacts a much, much wider audience of both
sex, despite the shounen/shoujo categorizations.
Not to say that American cartoonos are all bad, but they are a very different style of animation from the Japanese
artwork that has come to be called "anime."