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Term Definition
Mausoleum. A large and grand tomb.  
Maximum Capable Earthquake. The maximum level of earthquake ground shaking which may ever be expected at the building site within the known geological framework; this intensity may be taken as the level of earthquake ground motion that has a 10 percent probability of being exceeded in a 100-year time period.  
Maximum Size Aggregate. Aggregate whose largest particle size is present in sufficient quantity to affect the physical properties of concrete; generally designated by the sieve size on which the maximum amount permitted to be retained is 5 to 10 percent by weight.  
Maximum. (Pl. maxima) The highest possible or attainable amount.  
MB. Megabyte. 1,024,000 bytes.  
MBH. Thousands of British Thermal Units; for example, 82 MBH = 82,000 BTU.  
MBMA. Metal Building Manufacturers Association.  
MC. 1. Medicine Cabinet. 2. Medium-Curing Asphalt.  
MCM. Thousand circular mils, designating wire size.  
MCS. Multiple Chemical Sensitivity; a condition in which a person is considered to be sensitive to a number of chemicals at very low concentrations.  
MDF. Medium-Density Fiberboard.  
ME. Mechanical Engineer.  
Mean Effective Pressure (MEP). Average pressure on a surface when a changing pressure condition exists.  
Mean Radiant Temperature. The weighted average of all radiating surface temperatures within one line of sight.  
Mean. 1. The middle term in a progression of values. 2. Average.  
Meat Case. A refrigerated unit for the storage and preservation of meat.  
Mechanical Adhesion. Adhesion between surfaces in which the adhesive holds the parts together by interlocking action.  
Mechanical Application. Application of plaster mortar by mechanical means, generally pumping and spraying; distinguished from hand application with a trowel.  
Mechanical Bond. 1. The physical keying of one plaster coat to another or to the plaster base. 2. Tying masonry units together with metal ties or reinforcing steel or keys.  
Mechanical Cycle. Cycle which is a repetitive series of mechanical events.  
Mechanical Engineer. An engineer who designs plumbing, air conditioning, and other environmental systems for buildings.  
Mechanical Skimmer. see Surface Skimmer.  
Mechanical Trowel. A power machine used to smooth and compact plaster finish coats; capable of producing an extremely smooth, dense surface; consists of revolving metal or rubber blades; also called a Power Trowel.  
Mechanical. 1. Of or relating to machinery or tools. 2. Relating to, governed by, or in accordance the principles of mechanics. 3. Anything in the plumbing, heating, air-conditioning, or fire sprinkler trades.  
Mechanics Lien. A charge against real estate for the value of work or materials incorporated thereon.  
Median Strip. A space between two opposing lanes of traffic, as in a divided highway.  
Median. 1. The middle value in a series of values. 2. A straight line in a triangle connecting a vertex with the midpoint of the opposite side.  
Mediation. An alternative dispute resolution method by which a mediator assists and urges the parties to find a mutually acceptable resolution to their differences; unlike an arbitrator, a mediator cannot impose a solution or secession on the parties.  
Medical Equipment. Apparatus or devices used in medical applications.  
Medical Gases. In a hospital, the gases that are piped throughout the building for bedside and laboratory use, such as oxygen and nitrous oxide  

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