The relevancy of a fact in evidence refers to its significance and importance in proving or disproving a particular issue in a legal case. In order for a fact to be admissible as evidence in court, it must be relevant to the case at hand. This means that the fact must have a tendency to make a material fact more or less probable than it would be without the evidence.
In other words, the fact must have some logical connection to the issues being litigated and must help the trier of fact (judge or jury) in reaching a decision. If a fact is not relevant to the case, it will likely be excluded as evidence. The relevancy of a fact in evidence is crucial in ensuring a fair and just outcome in legal proceedings.