For a particular purpose.
Created on the spur of the moment; impromptu.
Over the past 20 years or so, from South America to the Danube basin, ad hoc coalitions of politicians, activists and conscience-stricken billionaires (whose core activities, such as Povlsen’s clothing business, are often less than environmentally friendly), have rewilded millions of acres of mostly failed agricultural and grazing land.
Postulated solely to save a theory from being falsified, without making any new predictions.
Contrary to the traditional condoning of ad hoc hypotheses, and in line with Popper's and Grünbaum's approaches, we see, once an ad hoc hypothesis is introduced we are unhappy about it and try to eliminate it.
On the spur of the moment.
Learned borrowing from New Latin ad hoc (“to this, for this”).
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For a particular purpose.