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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   DIM statement
   DIM
      <programming> (From "dimension") A keyword in most versions
      of the BASIC programming language that declares the size of
      an array.  E.g.
       DIM A(100)
      declares a one-dimensional array with 101 numeric elements
      (including A(0)).
      Visual Basic uses the DIM (or "Dim") statement for any
      variable declaration, even scalars, e.g.
      Dim DepartmentNumber As Integer
      which declares a single (scalar) variable of type Integer.
      (1999-03-26)