Four Hundred

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Four Hundred,

the social elite; the number of people Mrs. Astor could accommodate in her ballroom. [Am. Usage: Misc.]
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The epicRealm XT-S 400 allows businesses to deliver accelerated performance to their users, enabling them to extend the life of their already significant infrastructure investments and at the same time avoid high-cost equipment expenditures," said B.
2 and 5 in the country, respectively, in the 400 hurdles as juniors.