Adjective
Capable of being tested or proved.
Capable of being devised, or given by will.
Source: Webster's dictionaryThe usefulness of the models in constructing a testable theory of the process is severely limited by the quickly increasing number of parameters which must be estimated in order to compare the predictions of the models with empirical results. Anatol Rapoport
A well-understood and testable hypothesis like sexual selection surely trumps an untestable appeal to the inscrutable caprices of a creator. Jerry Coyne
Darwinism is not a testable scientific theory, but a metaphysical research program. Karl Popper
In the end, theistic evolution is not a useful compromise between science and religion. Insofar as it makes testable predictions, it has been falsified, and insofar as it makes claims that can't be tested, it can be ignored. Jerry Coyne
Where we have good, testable explanations, they then have to be tested, and we drop the ones that fail the tests. David Deutsch
One very important aspect of string theory is definitely testable. That was the prediction of supersymmetry, which emerged from string theory in the early '70s. Edward Witten