lagu

Old English lagu comes from Old Norse lǫg (plural of lag), meaning 'something laid down, a layer, a rule.' The word entered English during the Danelaw period — the ninth and tenth centuries, when Scandinavian settlers governed large parts of northern England. The Danelaw itself demonstrates the point: Danish law was laid down in English territory, and the English word for law came from the language of the people who laid it. English replaced its earlier Germanic terms for customary rules with the Viking word.

The Norse etymological image — something laid down — contrasts with the Latin-derived word 'legislation,' from lēx (law) + lātiō (a carrying, a proposing). Legislation is law carried forward, proposed, actively moved. Law is law laid down, settled, passive. The Norse image suggests permanence. The Latin image suggests process. English kept both, using 'law' for the thing that exists and 'legislation' for the act of making it.

English common law — judge-made law, developed through precedent rather than statute — is one of the most influential legal systems on earth. It governs approximately 30% of the world's population, including the United States, the United Kingdom, Canada, Australia, India, and much of Africa. The system's peculiarity is that law accumulates rather than being enacted. Each judicial decision lays down another layer. The Old Norse image — something laid — is accidentally perfect.

The word's extension to natural law, scientific law, and moral law happened by analogy. Newton's laws of motion are not enacted by a legislature. They are patterns observed in nature, 'laid down' by the universe rather than by a lawgiver. The same word covers human rules, divine commandments, and physical constants. The breadth is either a strength or a confusion, depending on how carefully you distinguish between rules that can be broken and patterns that cannot.