(idiomatic) A simple remedy for a difficult or complex problem, especially a cure for a disease.

A female given name from Hebrew / Mary Magdalene, a disciple of Jesus. / (Cambridge University, informal) Ellipsis of Magdalene College, Cambridge.

A reformed prostitute.

(inorganic chemistry) A white powder (MgO) with a high melting point; it occurs naturally as periclase, an ore of magnesium.

(historical) A charter granted by King John to the barons at Runnymede in 1215, which is one of the bases of English constitutional tradition; a physical copy of this charter, or a later version.

(figuratively) A landmark document that sets out rights or important principles.

(physics, of a transuranic nuclide) Having filled shells of both protons and neutrons and therefore having extra stability and a longer half-life than normal.

The class of scale or magnitude of any amount, where each class contains values of a fixed ratio (most often 10) to the class preceding it. For example, something that is 2 orders of magnitude larger is 100 times larger, something that is 3 orders of magnitude larger is 1000 times larger, and something that is 6 orders of magnitude larger is a million times larger, because 10² = 100, 10³ = 1000, and 10⁶ = a million.

(nautical) Any of several small bar magnets placed and adjusted within a ship's binnacle to correct for the effects of other magnetic influences in the ship.

(physics) A material, or piece of such material, which retains its magnetism even when not subjected to any external magnetic fields.