QUANT. number, series, set Your argument is based on a set of questionable assumptions.
VERB + ASSUMPTION make She's always making assumptions about how much money people have. | base sth on, start from, work on We are working on the assumption that the techniques are safe. | accept | challenge, disprove, question, test
ASSUMPTION + VERB underly sth, underpin sth the assumptions underlying their beliefs
PREP. on the ~ that I set the table for eight people, on the assumption that Jo would come. | ~ about assumptions about how women should behave