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1 definition found
 for principal type
From The Free On-line Dictionary of Computing (30 December 2018) :

  principal type
  
     The most general type of an expression.  For example, the
     following are all valid types for the lambda abstraction
     (\ x . x):
  
     	Int -> Int
     	Bool -> Bool
     	(a->b) -> (a->b)
  
     but any valid type will be an instance of the principal type:
     a -> a.  An instance is derived by substituting the same type
     expression for all occurences of some type variable.  The
     principal type of an expression can be computed from those of
     its subexpressions by Robinson's unification algorithm.
  
     (1994-12-16)
  

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