1. Evidence sufficient to establish a thing as true, or to produce belief in its truth.
2. The act of testing or making a trial of anything; a test; a trial.
3. The establishment of the truth of anything; a demonstration.
4. A sequence of steps, statements, or demonstrations that leads to a valid conclusion.
5. A test to determine the quality, durability, etc., of materials used in manufacturing.

1. To make a trial impression of something that is printed or engraved.
2. To read printed copy or to inspect a printed impression for errors.
3. To make something capable of resisting harm, injury, or damage: The store had coats made of fabric proofed material that prevented shrinkage.