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seven-seven

7-7 or 7/7

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noun
the 7th of July 2005, the day on which a series of suicide bombings were carried out on the London public transport system by Islamic fundamentalists
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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.

Word Origin for seven-seven

C21: by analogy with nine-eleven
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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