Anime: Japanese for animation. Japan has a thriving industry for animation of all types, including movies with adult themes. While there are some styles - like the big-eyes look - that seen indicative of anime, there is such a variety in drawing styles that anime cannot be restricted to just one of its stylistic offshoots.
Bushi: Originally applied to soldiers in the service of a shogun, it's evolved into a term that applies to all professional warriors.
Bushido: The code of the warrior.
Chibi: Used to describe characters as small, little or young.
Eno: Ancient name of the city that became Tokyo.
Gaijin: Foreigner.
Hentai: While this word means transformation, in anime it means a form of perversion. There are many shockingly adult anime movies which are referred to as hentai.
Kappa: A monster that lives in rivers.
Kawaii: Cute. The characters in a child's anime series such as Sailor Moon could safely be referred to as kawaii.
Ki: Literally meaning air. Figurative meaning life-force energy. Familiar as the Chinese word 'chi'.
Manga: Refers to comic books, not animation.
Mecha: Also as mech. Means cool technology or mechanical items.
Otaku: Japanese equivalent of "fan boy". Someone who's obsessed with an anime series.
Ronin: Soldiers who are free of a master of leader. Sempai: Anyone who is master or senior in any type of organisation. - Tonight Reporter