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		Definition of unknown quantity in English: unknown quantitynoun  A person or thing whose nature, value, or significance cannot be determined or is not yet known.  the producers replaced her with an unknown quantity  a student ensemble is always something of an unknown quantity  Example sentencesExamples -  The newly appointed director was still for most people something of an unknown quantity.
 -  The label Frankenfoods is, as always, the way to get press, and a decent metaphor for the ambiguous nature of the unknown quantity.
 -  Perhaps they'll land on some desolate planet where rock & roll is an unknown quantity.
 -  ‘When I came to The Stoop I was an unknown quantity, but I have proved myself,’ he said.
 -  He said: ‘Her successor is an unknown quantity as yet but eventually I hope to raise the issue with him.’
 -  He'd be a little off centre, a little more alien - it would make him an unknown quantity as Superman and appear nerdy and disconnected as Kent.
 -  Cowen remains something of an unknown quantity on the issue, but those who have followed the career of the new finance minister claim he takes his lead from civil servants.
 -  On top of that, he's also something of an unknown quantity in Premiership terms, just like Stead was when he first joined Rovers from Huddersfield a year ago.
 -  To be sure the Australian true crime book is not an unknown quantity, but how often does it propagate beyond its native shores?
 -  ‘We've yet to play Sheffield this season so they are a bit of an unknown quantity,’ said Brown.
 -  Let's not gamble that with somebody who is an unknown quantity.
 -  When I questioned one member about this, he suggested that was because the committee knew the reformers well, while the landowners were an unknown quantity.
 -  He is an astute negotiator in the field but he remains something of an unknown quantity when it comes to national partnership talks.
 -  Rather than the unknown quantity of last year, this year's five couples were chosen in what was a rather cynical approach to conflict and contest.
 -  Dislocated people: they're an unknown quantity, aren't they?
 -  Morris is an enigmatic moviemaker, an unknown quantity in the filmmaker personality department.
 -  She's an unknown quantity right now, so it could all work for the state.
 -  To a certain extent, he feels Galway are a bit of an unknown quantity, pointing out that he had only seen bits of pieces of them in televised games.
 -  Europe makes them something of an unknown quantity.
 -  ‘They're an unknown quantity and they're at home so you never know,’ he said.
 
    Definition of unknown quantity in US English: unknown quantitynoun A person or thing whose nature, value, or significance cannot be determined or is not yet known.  the producers replaced her with an unknown quantity  Example sentencesExamples -  Let's not gamble that with somebody who is an unknown quantity.
 -  He is an astute negotiator in the field but he remains something of an unknown quantity when it comes to national partnership talks.
 -  She's an unknown quantity right now, so it could all work for the state.
 -  He said: ‘Her successor is an unknown quantity as yet but eventually I hope to raise the issue with him.’
 -  The newly appointed director was still for most people something of an unknown quantity.
 -  Cowen remains something of an unknown quantity on the issue, but those who have followed the career of the new finance minister claim he takes his lead from civil servants.
 -  ‘They're an unknown quantity and they're at home so you never know,’ he said.
 -  To be sure the Australian true crime book is not an unknown quantity, but how often does it propagate beyond its native shores?
 -  ‘We've yet to play Sheffield this season so they are a bit of an unknown quantity,’ said Brown.
 -  On top of that, he's also something of an unknown quantity in Premiership terms, just like Stead was when he first joined Rovers from Huddersfield a year ago.
 -  ‘When I came to The Stoop I was an unknown quantity, but I have proved myself,’ he said.
 -  He'd be a little off centre, a little more alien - it would make him an unknown quantity as Superman and appear nerdy and disconnected as Kent.
 -  Rather than the unknown quantity of last year, this year's five couples were chosen in what was a rather cynical approach to conflict and contest.
 -  The label Frankenfoods is, as always, the way to get press, and a decent metaphor for the ambiguous nature of the unknown quantity.
 -  To a certain extent, he feels Galway are a bit of an unknown quantity, pointing out that he had only seen bits of pieces of them in televised games.
 -  Dislocated people: they're an unknown quantity, aren't they?
 -  Europe makes them something of an unknown quantity.
 -  Morris is an enigmatic moviemaker, an unknown quantity in the filmmaker personality department.
 -  Perhaps they'll land on some desolate planet where rock & roll is an unknown quantity.
 -  When I questioned one member about this, he suggested that was because the committee knew the reformers well, while the landowners were an unknown quantity.
 
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