A number of
a collection of persons or things; several. for example, a number of tours are available, or we’ve visited a number of times. this idiom often is modified by an adjective giving some idea of quant-ty, as in only a small number are going. [ 1300s ]
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- A number one  [ey wuhn] /ˈeɪ ˈwʌn/ adjective noting a vessel regarded by a shipping-cl-ssification society as being equipped to the highest standard and with equipment maintained in first-cl-ss condition. also, a number one. informal. first-cl-ss; excellent; superior: the meals there are a one. also, a-one, a 1, a-1. 
- A o c nier  [neer] /nɪər/ noun alfred otto carl, 1911–1994, u.s. physicist. 
- A o carl nier  [neer] /nɪər/ noun alfred otto carl, 1911–1994, u.s. physicist. 
- A o k  [ey-oh-key] /ˈeɪ oʊˈkeɪ/ adjective, adverb informal. ok; perfect: an a-ok rocket launching. also, a-o.k. a-okay. a-ok adjective (informal, mainly us) in perfect working order; excellent word origin c20: from a(ll systems) ok a-ok 1961, said to be an abbreviation of all (systems) ok; popularized in the jargon of u.s. astronauts. see ok. adjective proceeding or […] 
- A o u  american ornithologists’ union. 
