Is Avatar: the Last Airbender an anime? Valid points are stated in this video. 


  In Western countries, anime is thought of as Eastern animation. In Eastern countries, all animation are thought of as anime.


So this question kind of leads to what is an anime? Does having a published manga a requirement to become an anime? Let's settle this once and for all, is Avatar: the Last Airbender an anime or not?
Anime basically translates to animation, so the Japanese don't really have a distinction. Claymation for example could qualify as 'anime' in the East.



From a Western perspective, 'anime' is a looser term, generally meaning animations from Japan, but sometimes it's applied to Western shows with the anime 'look', like RWBY or Avatar.

There's no strict guideline on what qualifies as anime and what doesn't, and arguments arise frequently online by people with different opinions on this. 

It's safest to say Avatar is anime-styled.

In regards to the 'manga' of Avatar, it seems to be commonly referred to as a comic rather than a manga. But the format of this should have no bearing on the animated production.