GNU Collaborative International Dictionary of English

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Found one definition

1.       
    Monotonic (?), Monotonical (?),  a.
   1. Of, pertaining to, or uttered in, a monotone; monotonous. “Monotonical declamation.”  Chesterfield.
   
   [1913 Webster]
   
   
   2. (Math.) Always increasing or always decreasing, as the value of the independent variable increases; -- of a function.
   
   [PJC]