One of the mysteries of the English language finally explained.
1‘discussions were held on an ad hoc basis’
impromptu, extempore, extemporary, extemporaneous, expedient, emergency, improvised, rough and ready, makeshift, make-do, cobbled together, thrown together
informal quick and dirty
1‘committees of enquiry can be set up ad hoc’
as the need arises, when necessary, when needed
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