Jisho

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Wikipedia definition
1. Ecchiis an often used slang term in the Japanese language for erotic fantasy and sexual innuendoes. As an adjective it is used with the meaning of "dirty", "naughty", "frivolous"; as a verb (ecchi suru), with the meaning to do something dirty, naughty, frivolous or to sleep together; or as a noun, to describe someone that is seen as ecchi. It is a synonym for ero and does not have such a harsh meaning as hentai. The word is not only common in Japan.
Read “Ecchi” on English Wikipedia
Read “エッチ” on Japanese Wikipedia
Read “Ecchi” on DBpedia

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