catchment UK /ˈkatʃmənt/US /ˈkɛt͡ʃmənt/noun 2verb 1forms 3 noun2 •[before a noun] Any structure or land feature which catches and holds water; the collection of such water.Do you think that there ought to be some board or some authority for each catchment basin, which must be appointed with adequate powers to prevent the pollution of streams? — 1864 •A catchment area, or the people it serves. verb1 •To divide into catchment areas.the catchmenting of mental health services formscatchmented · catchmenting · catchments