What is Admissible Evidence?

Legal Definition
Admissible evidence, in a court of law, is any testimonial, documentary, or tangible evidence that may be introduced to a factfinder—usually a judge or jury—to establish or to bolster a point put forth by a party to the proceeding. For evidence to be admissible, it must be relevant, without being unfairly prejudicial, and it must have some indicia of reliability. The general rule in evidence is that all relevant evidence is admissible and all irrelevant evidence is inadmissible.
-- Wikipedia
Legal Definition
Evidence that is formally presented before the trier of fact (i.e., the judge or jury) to consider in deciding the case. The trial court judge determines whether or not the evidence may be proffered. To be admissible in court, the evidence must be relevant (i.e., material and having probative value) and not outweighed by countervailing considerations (e.g., the evidence is unfairly prejudicial, confusing, a waste of time, privileged, or based on hearsay). Also termed competent evidence; proper evidence; legal evidence.
Legal Definition
any evidence that is allowed to be introduced during the trial.