evidence

n. proof, something which proves or disproves

v. offer proof, prove, show to be true

Evidence in its broadest sense, includes anything that is used to determine or demonstrate the truth of an assertion. Philosophically, evidence can include propositions which are presumed to be true used in support of other propositions that are presumed to be falsifiable. The term has specialized meanings when used with respect to specific fields, such as policy, scientific research, criminal investigations, and legal discourse.
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n. evidence, obviousness

(v. t.)
To render evident or clear; to prove; to evince; as, to evidence a fact, or the guilt of an offender.
  

(n.)
That which makes evident or manifest; that which furnishes, or tends to furnish, proof; any mode of proof; the ground of belief or judgement; as, the evidence of our senses; evidence of the truth or falsehood of a statement.
  

(n.)
That which is legally submitted to competent tribunal, as a means of ascertaining the truth of any alleged matter of fact under investigation before it; means of making proof; -- the latter, strictly speaking, not being synonymous with evidence, but rather the effect of it.
  

(n.)
One who bears witness.
  

Signs that something is true or not true. Doctors can use published studies as evidence that a treatment works or does not work.