I understand it is a political definition...
and I am being somewhat ocd to take it any further, but why would the word reactionary come to describe radical right wing without having any contextual relationship to the root word react? For all the relationship the word has to react, reactionary could just as easily been chosen to describe a music lover and taxionary could be the right wing radical.
Or so it seems to me...yes, no?
And, this is a total hijacking of the original post but since I posted it I guess it is permissable
