Law Dictionary - Glossary and Meanings of Legal Terms Have you ever heard O'Brien Law about Ignorantia juris non excusat or Ignorantia legis neminem excusat? These are Latin phrases which encode the legal principle that ignorance of law is no excuse. In short, no one can escape the liability for violating a law by claiming that he was unaware or ignorant of the law. Even though this legal principle has many exceptions, normally, it is deemed that the people of a certain territory are aware of the laws applicable to that jurisdiction (at least the ones which may affect their day-to-day activities). However, many are still ignorant of the relevant laws and land in trouble. Forget about the laws, even legal terms are confusing and unnerving for many, except those with substantial legal training. But don't panic; a little bit of effort can help you understand law terms. The following is a legal terminology list, which is a compilation of some common legal terms and meanings that will make your confrontation with laws a lot easier. A A fortiori: Latin term used to denote a reason, which is similar to the existing one, but more stronger in nature. This term is often used to explain a situation in which one fact is already proven and ascertained, then it can be inferred that the related second fact is more true. For example, it is already proved that 'A' can carry a weight of 120 kilograms. Then, a fortiori, 'A' can also carry this object, which is only 60 kilograms in weight'. Ab Initio: Latin term, commonly used in association with contracts and marriages. It means 'from the very beginning'. The marriage is void ab initio, means that the marriage was not valid from the beginning itself. A Priori: Latin term, which means that 'from the cause to the effect'. It is based on the assumption that if the cause is a generally accepted truth, then a particular effect must follow. So, a priori judgment is considered to be true, but based on presumption and not on factual evidence. Abandonment: The voluntary relinquishment of a right by express words or by action. This term can be used in the context of rights or obligations under a contract, over property, person (spouse or children) or voluntary withdrawal from the commission of a crime. Abandoned Property: Such property, which has been abandoned by the owner. Abatement: This term refers to the plea to squash and end a suit. It may also denote reducing or lessening of something. For example, in case of an eviction case, where the landlord is seeking unpaid rent, the tenant may make a plea for rent abatement, citing the poor living conditions of his premises. Abduction: Refers to the crime of taking away a person by fraud, persuasion or force. It is different from kidnapping, which is done by force or threat only. Abet: To aid or assist someone in committing a crime or inducing another to commit a crime. The person who gives assistance is called the abettor. Abeyance: The condition of being suspended temporarily. If the ownership of a property is yet to be ascertained, it is said to be in abeyance.