Source : Free On-Line Dictionary of Computing

nullary
     
         A description of an {operator} or {function}
        which takes no {arguments}, e.g. a function that returns the
        current time.
     
        "Nullary" is part of the {unary}, {binary}, {ternary}
        sequence, and is more common than its synonym {niladic}.
     
        (2001-02-25)