Falsifiability is the assertion that for any hypothesis to have credence, it must be inherently disprovable before it can become accepted as a scientific hypothesis or theory.

A statement, hypothesis, or theory is falsifiable if it can be demonstrated to be false by observation. More technically, it is falsifiable if it is contradicted by a basic statement, which, in an eventual successful or failed falsification, must respectively correspond to a true or hypothetical observation.

[link to plato.stanford.edu (secure)]
[link to www.britannica.com (secure)]
[link to www.bu.edu (secure)]