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Term Definition
Mass Curing. Adiabatic curing, using sealed containers.  
Mass Law. In acoustics, the law relating to the transmission loss of walls, which states that in a part of a frequency range, the magnitude of the loss is controlled entirely by the mass per unit area of the panel; also, that the transmission loss increases 1 decibel for each doubling of frequency or each doubling of the panel mass per unit area.  
Mass. 1. Quantity of matter held together so as to form one body. 2. A body of matter of indefinite shape. 3. The quantity of a body that is its measure of inertia.  
Master Key. A key that will open several locks, each keyed separately.  
Master. A fully qualified, proficient, skilled, and experienced builder, plumber, electrician, plasterer, painter, or other construction trade worker.  
Masterformat. The copyrighted title of a uniform indexing system for construction specifications, as created by the Construction Specifications Institute and Construction Specifications Canada, commonly called the CSI format or numbering system.  
Masterkeying. An arrangement of door lock cylinders having individual key changes which permits them all to be operated by a single key called the master key.  
Mastic Grout. A chemical mixture of organic and inorganic ingredients forming a one part grouting composition that is used directly from the manufacturer; it is more flexible and stain resistant than cement grout.  
Mastic. 1. High viscosity solvent-based adhesive. 2. A pasty material used as a cement, as for setting tile, or a protective coating, as for thermal insulation or waterproofing. 3. Organic tile adhesive. 4. A viscous, dough-like, adhesive substance; can be any of a large number of formulations for different purposes such as sealants, adhesives, glazing compounds, or roofing membranes; see Asphalt Mastic and Flashing Cement.  
Mat Formwork. The temporary support for a concrete mat during the pouring or placing of concrete.  
Mat Foundation. A concrete slab used as a building or equipment foundation.  
Mat Glaze. A colorless or colored ceramic glaze having low gloss.  
Mat Reinforcing. The placing of metal or steel bars in freshly poured concrete mat to strengthen it.  
Mat, Concrete. see concrete Mat.  
Mat, Floor. see Floor Mat.  
Mat. 1. A large footing or foundation slab used to support an entire structure. 2. A grid of reinforcing bars.  
Matched Lumber. Lumber that is edge-dressed and shaped to make a close tongue-and-groove joint.  
Matching. Machining boards to form tongue and groove joints.  
Material Handling. The act or process of transporting materials on or to a jobsite.  
Material. 1. The matter from which things are made. 2. The physical things needed for construction. 3. Important, essential, and relevant.  
Materialman. An individual or organization who supplies construction materials to a project.  
Materials Used. This includes the cost of all materials used on the job; usually the largest single expense item on income and expense statement.  
Materiel. The materials, equipment, and supplies used in a business or on a project.  
Matrix. In concrete, the material that fills the spaces between the fine and course aggregates; the cement paste.  
Matter. A physical substance in general that has mass and occupies space; occurs in the state or form of solid, liquid, or gas.  
Mattock. A hand implement used for digging and grubbing, with features of a pick and an adze.  
Maturing Range. The time-temperature range within which a ceramic body, glaze, or other composition may be fired to yield specified properties.  
Maturity Date. The date on which an obligation becomes due.  
Maul. 1. A heavy hammer for driving wedges. 2. A tool like a sledge hammer with one wedge-shaped end, used to split wood.  
Maulstick. A light stick with a padded leather ball at one end, held by a painter in one hand to support the other hand.  

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