The word is 'butou' - 舞踏. nihongoresources turns up:
舞踏 [ぶとう] [butou] - (n) dancing.
舞蹈 [ぶとう] [butou] - (n) dancing.
But it's used to refer to, well, a battle. It could be another of Sunrise's multilingual puns - 'butou' sounds a lot like 'battle'. Anyway, lad back in one of the early eps did some crazy conflagaration and came up with mai-battle, given that the reading of the kanji 舞 (dance) is 'mai'.
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