(Latin, what is given)
A piece of evidence considered as fixed for the purpose in hand. What is taken as a datum may change as changes of theory and evidence arise. Something would be absolutely a datum if it were incorrigible, but many theorists of knowledge tend to be nervous about regarding anything as absolutely given, for although some things may serve as a basis for particular enquiries, this does not protect them from eventual challenge. See epistemology, protocol statements, verification; see also sense datum.