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2 definitions found
 for pre-order
From The Collaborative International Dictionary of English v.0.48 :

  Preorder \Pre*or"der\, v. t.
     To order to arrange beforehand; to foreordain. --Sir W.
     Hamilton.
     [1913 Webster]

From The Free On-line Dictionary of Computing (30 December 2018) :

  pre-order
  
     
  
     1. traversal.
  
     2. A relation R is a pre-order if it is reflexive
     (x R x) and transitive (x R y R z => x R z).  If it is also
     antisymmetric (x R y R x => x = y) then it is a partial
     ordering.
  
     (2001-10-01)
  

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