Source : Webster's Revised Unabridged Dictionary (1913)

Monadic \Mo*nad"ic\, Monadical \Mo*nad"ic*al\, a.
   Of, pertaining to, or like, a monad, in any of its senses.
   See {Monad}, n. --Dr. H. More.

Source : Free On-Line Dictionary of Computing

monadic
     
        1.  {unary}, when describing an {operator} or
        {function}.  The term is part of the {dyadic}, {niladic}
        sequence.
     
        2.  See {monad}.
     
        (1998-07-24)