Mast/mæst/ Definition 1 of 3Pro Tip 1/3Nautical Term Used in a sailing context to describe the structure on a ship. During the storm, the ship's mast cracked under the pressure. Pro Tip 2/3Part of Rigging Refers to a key component of the ship that aids in control and propulsion. The crew spent the morning repairing the rigging around the mast. Pro Tip 3/3Visual Imagery Mast as a symbol can evoke images of adventure and exploration. He gazed at the mast, dreaming of distant lands.