Business and Personal Finance Dictionary

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• GRANDFATHER CLAUSE
  
  A provision in a law that ensures that the law is not retroactive, that it does not render a previously legal thing illegal. For example, a new zoning by-law requiring all houses to be at least five feet from the side lot line would not render illegal a 20-year-old house that stands three feet from the side lot line. The property would be described as "legal non-conforming".
  
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