Substantiation (noun)

1. The act of providing evidence or proof in support of a statement or belief.
2. The evidence or proof provided to support a statement or belief.

Origin:

From the latin substantiatio, from substantia (substance).

Examples:

1. The prosecution must provide substantial substantiation of their case before the trial begins.
2. The lawyer asked for additional substantiation of the witness's testimony.
3. The company was unable to provide any substantiation for their claims of increased profits.
4. The scientist's theory was finally accepted after he provided substantial substantiation in the form of experiments.
5. The artist's new work was met with skepticism, but she was able to provide ample substantiation of her techniques and materials.