lifecycle or life-cycle or life cycle

[T K <tvk_tw -at- yahoo -dot- ie>]

Hi,
  
  I am wondering what is the correct way of writing the term lifecycle (or is it life-cycle or life cycle) in the context of   the systems development lifecycle or a software lifecycle etc.
  
  I have   seen the three options lifecycle, life-cycle and life cycle used, although it   seems that if popularity is an indicator then life cycle is the correct   term.
  
  Please advise...
  
  Best regards,
  Tom.
  
  PS Is there a   difference between US English and UK English for this? 
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