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Adj.1.55 - being five more than fifty55 - being five more than fifty    
cardinal - being or denoting a numerical quantity but not order; "cardinal numbers"
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Built in 55 AD by the Romans as a fort, the castle was renovated by the 3rd Marquess of Bute, John Crichton-Stuart, and William Burges in a gothic style between 1868 to 1930.