With respect to the scientific method, capable of being proven true or false.(adjective)
Capable of being devised, or given by will.(adjective)
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Use "testable" in a sentence
"The tendency to demand hypotheses be formulated in testable ways?"
"But his religious views apparently contain testable but false, propositions about the natural, physical world, propositions which contradict his scientific writings."
"The effect he seems to have in mind as most testable is uncertainty."