Definition of 一兆
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(n) 1,000,000,000,000; one trillion; one billion (obs. British)
おまえはどうして、百匹のねこ、千匹のねこ、百万匹、一億、一兆匹のねこといっしょに、食べられてしまわなかったのだね。?
How does it happen that you were not eaten up with all those hundreds and trillions of cats?