Definition of "oncer" [oncer]

• A one-pound note. (noun)
• A person who does something once. (noun)

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• "But she holds Bennelong by the slenderest of margins - 0.3 per cent - which means it's exactly the sort of seat Labor must hold if Ms McKew is to avoid becoming a "oncer" and Ms"
• "Can I come and see you at oncer Poirot let a few moments elapse before he answered."
• "I read somewhere a few years ago that for every oncer of your hard-earned, only 10 pennies end up in the hands of the really needy."