"demonstrable evidence" means providing clear and undeniable proof or examples that support a certain claim or statement. It refers to evidence that can be seen, observed, or proven, making it more convincing and reliable. Full definition
The awards include the category of Junior Lawyer of the Year, for which the Law Society is looking for demonstrable evidence of an individual who has an exceptional standard of work as well as great dedication in their role. (newlawjournal.co.uk)
Today, the movement has realized that science is much more likely to reach an audience which is increasingly looking for demonstrable evidence from which to base their position on social issues. (religion.blogs.cnn.com)
one is about demonstrable evidence to support claims and hypothesis. (religion.blogs.cnn.com)