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Term Definition
Absorbent. Having the ability to suck up liquid, gas, or heat.  
Absorber. The blackened surface in a solar collector that absorbs the solar radiation and converts it to heat energy.  
Absorptance. The ratio of light absorbed by a material to incident light falling on it.  
Absorption Chiller. A system similar to a vapor compression chiller with the exception that it does not use a compressor, but uses thermal energy (low pressure steam, hot water, or other hot liquids) to produce the cooling effect.  
Absorption Coefficient. The absorption coefficient of a material or sound-absorbing device is the ratio of the sound absorbed to the sound incident on the material or device; the sound absorbed by a material or device is usually taken as the sound energy incident on the surface minus the sound energy reflected.  
Absorption Rate. 1. The speed at which the real estate market can absorb new offerings of land or buildings during a specified period of time. 2. The amount of water absorbed when a brick is partially immersed for one minute; usually expressed in either grams or ounces per minute per 30 sq. in; also called suction or initial rate of absorption.  
Absorption Refrigerator. Refrigerator which creates low temperatures by using the cooling effect formed when a refrigerant is absorbed by chemical substance.  
Absorption, Total. The amount of water a masonry unit will absorb when immersed in water.Absorption.The relationship of the weight of the water absorbed by a material specimen subjected to prescribed immersion procre, to the weight of the dry specimen, expressed in percent.  
Abstract of Title. A written summary of all transactions that could affect the ownership of a piece of real property, including deeds, leases, liens, and wills.  
Abutment Piece or Member. The bearing plate or piece of a wall system to which the loads are transferred.  
Abutment. The lateral supporting structure of an arch, bridge or similar pressure; that part of a pier or wall from which an arch springs, specifically the support at either end of an arch, beam or bridge; that part of a structure which takes the thrust of a beam, arch, vault, truss or girder; the part of a bridge that supports the end of the span and prevents the bank from sliding under it; a foundation that carries gravity and also thrust loads.  
AC Relay. An electromagnetic or electromechanical valve or switch using small currents and voltages to control the making or breaking of electrical contacts on a circuit.  
AC. 1. Air Conditioning. 2. Asphaltic Concrete. 3. Alternating Current.  
Accelerate. To quicken or hasten the natural progress of certain actions or events.  
Accelerated Depreciation. The declining balance and sum of the years digits method which give greater depreciation to the early years of the life of the assets.  
Accelerating Admixture. Substance that increases the rate of hydration, shortens setting time, or increases strength development in concrete, mortar, grout, or plaster.  
Acceleration Clause. A clause in a mortgage or trust deed that would allow the lender to call the whole loan due at any time that certain specified events occur, such as a default in payments or sale of the property.  
Acceleration. 1. Requiring change order work to be done without extension of the contract time. 2. An increase in the rate of speed.  
Accelerator. A substance which, when added to concrete, mortar, grout, or plaster, increases the rate of hydration of the hydraulic cement, shortens the time of setting, or increases the rate of hardening of strength development, or both; materials used to speed up the setting of mortar or concrete.  
Accelerogram. The record from an accelerograph showing acceleration as a function of time.  
Acceptance. 1. Manifestation that a party assents or agrees to a contract. 2. Approval of the work of a construction contract.  
Access Control. A computerized security system designed to protect against unauthorized entry into buildings or building areas.  
Access Door. A door or panel creating a means of access for the inspection or repair of concealed equipment.  
Access Floor. A raised floor platform with removable panels to provide access to the area below.  
Access Panel. Removable or swinging panel, usually flush with adjoining surface to provide access to concealed equipment or system components for inspection and maintenance purposes.  
Access Stair. A stair system to provide specific access to roofs, mechanical equipment rooms, or as a means of emergency exit.  
Access/Secure Control Unit. The controlling device of a computerized security system designed to protect against unauthorized entry into buildings or building areas.  
Accessible Heremetic. Assembly of motor and compressor inside a single bolted housing unit.  
Accessible Location. A location which can be reached by standing on the floor, platform, runway, or other permanent working area.  
Accessible. 1. As applied to equipment, admitting close approach because not guarded by locked doors (unless keys are readily available to those requiring access), elevation or other effective means. 2. As applied to wiring methods, not permanently closed in by the structure or finish of the building; capable of being removed without disturbing the building structure, finish, or fixed appurtenance thereto.  

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