Magnum/ˈmæɡnəm/ Definition 1 of 3Pro Tip 1/3Celebration Size A magnum often symbolizes celebration or luxury due to its large size. For their golden anniversary, they popped open a magnum of vintage wine. Pro Tip 2/3Special Occasions Magnums are usually reserved for special events, not casual drinking. They ordered a magnum to share for the New Year's toast. Pro Tip 3/3Larger Than Life In other contexts, 'magnum' can imply something larger or greater than usual. The artist's magnum work was displayed in the center of the gallery.