(1):

(n.) One whose occupation is to build with stone or brick; also, one who prepares stone for building purposes.

(2):

(n.) A member of the fraternity of Freemasons. See Freemason.

(3):

(v. t.) To build stonework or brickwork about, under, in, over, etc.; to construct by masons; - with a prepositional suffix; as, to mason up a well or terrace; to mason in a kettle or boiler.