The meaning of MASON is a skilled worker who builds by laying units of substantial material (such as stone or brick). Define mason . mason synonyms, mason pronunciation, mason translation, English dictionary definition of mason . n. 1. One who builds or works with stone or brick. 2. Mason A Freemason. tr.v. ma·soned , ma·son·ing , ma·sons To build of or strengthen with masonry.... If you spent the summer building a beautiful stone wall around your backyard, you may have a future as a mason , someone who builds things out of brick or stone. Mason definition: a person whose trade is building with units of various natural or artificial mineral products, as stones, bricks, cinder blocks, or tiles, usually with the use of mortar or cement as a bonding agent..