Noun
(chiefly philosophy, uncountable) Introduction of evidence which conclusively establishes that a belief or hypothesis is not true or which diminishes the acceptability of a belief or hypothesis.
(countable) A particular fact, observation, or other item of evidence which shows or tends to show that a belief or hypothesis is not true.
Source: en.wiktionary.orgAll testing, all confirmation and disconfirmation of a hypothesis takes place already within a system. Ludwig Wittgenstein