Jisho

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Adverb (fukushi)
1. so; really; seemingKansai dialect, See also そう
Wikipedia definition
2. Se (kana)せ, in hiragana, or セ in katakana, is one of the Japanese kana, each of which represents one mora. Both represent the sound [se se], and when written with dakuten represent the sound [ze ze]. In the Ainu language, the katakana セ is sometimes written with a handakuten (which can be entered into a computer as either one character or two combined ones) to represent the [t͡se t͡se] sound, and is interchangeable with チェ.
Read “Se (kana)” on English Wikipedia
Read “せ” on Japanese Wikipedia
Read “Se (kana)” on DBpedia

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