Presumption: A presumption is an assumption made by a court or tribunal that a particular fact is true until proven otherwise. It shifts the burden of proof to the party seeking to rebut the presumption.
Standard of Proof: The standard of proof refers to the degree of certainty required to establish a claim or allegation. This can vary depending on the context, such as the 'preponderance of evidence' in civil cases or the 'beyond reasonable doubt' standard in criminal cases.
Affirmative Defense: An affirmative defense is a legal argument made by a defendant that, even if the plaintiff's allegations are true, the defendant should not be held liable due to some other justification or excuse.