Sentence:  The law of <WSD>praemunire</WSD> dates from another century. No one who is alive now quite knows what it means. 
Meaning of the word marked with <WSD> tags:  The offence in English law of bringing suit in or obeying a foreign (especially papal) court or authority, thus challenging the supremacy of the Crown. The offence was created by the (Statute of Praemunire) 1393 (16 Richard II, chapter 5), and abolished by the (Criminal Law Act 1967) (chapter 58).