Definitions for a-one
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Princeton's WordNet
ace, A-one, crack, first-rate, super, tiptop, topnotch, top-notch, tops(p)(adj)
of the highest quality
"an ace reporter"; "a crack shot"; "a first-rate golfer"; "a super party"; "played top-notch tennis"; "an athlete in tiptop condition"; "she is absolutely tops"
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"a-one." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/a-one>.

