A document that is taken to have never been valid or enforceable.
A document that is void; as if it did not exist. In Latin, stated to be void ab initio.
For example, in many countries, contracts for immoral purposes are said to be void: unenforceable and not recognized by the courts.
A good example is a contract to commit a serious crime such as murder.
Compare with voidable and see also ab initio.