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Term Definition
Retainage. Amount of construction sum held back by the owner from the contractor to be paid after construction is satisfactorily completed; also called Retention.  
Retained Earnings. The accumulated earnings that are retained in a corporation since it was founded less the total of dividends declared to the stockholders.  
Retaining Wall. A wall that is designed to resist the lateral pressures of retained soil; a wall that holds back a hillside or is backfilled to create a level surface.  
Retardant, Fire. see Fire Retardant.  
Retardation. Delaying the hardening or strength gain of fresh concrete, mortar or grout.  
Retarder. 1. A concrete admixture used to slow down the natural curing process. 2. An admixture used to delay the setting action of plaster; generally used only with gypsum plasters or finish coat plaster containing calcined gypsum gauging. 3. Slow drying solvents or extenders added to lacquer to delay drying of the lacquer  
Retemper. Addition of water to portland cement plaster, mortar, or concrete after mixing but before setting process has started.  
Retention. Retainage.  
Retrofitting. To install new materials or equipment in an existing building.  
Return Air Duct. The duct by which air is returned from a room or space to the heating or cooling system to be reconditioned and re-used.  
Return Lines. Pipework returning water to be recooled or reheated. 2. Pipework returning filtered water to the pool.  
Return Off-Set. see Jumpover.  
Return on Investment. The percentage of earnings on the total assets of a corporation.  
Return Period of Earthquakes. The time period in which the probability that an earthquake of a certain magnitude will reoccur.  
Return Piping. That part of the piping between the filter and the pool, spa or hot tub through which passes the filtered water.  
Return. 1. Any surface turned back from the face of a principal surface. 2. The ending of a small splash wall or a wainscot at right angle to the major wall. 3. The continuation of a molding or finish of any kind in a different direction. 4. In HVAC, a term for the return-air duct of a forced air heating/cooling system. 5. The continuation in a different direction of the face of a building or any member.  
Rev. 1. Revised. 2. Revision. 3. Reverse. 4. Reversed.  
Reveal. The side of an opening, as a window or door jamb.  
Revenues. The gross income of a business.  
Reverberation Time. The time is takes sound to become inaudible; a function of a space, people, furnishings, and the absorptivity of the surfaces.  
Reverberation. The persistence or echoing of previously generated sound caused by reflection of acoustic waves from the surfaces of enclosed spaces; the support of sound by successive reflections.  
Reverse Coloring. The changing of yarn frames in Jacquard weaves to cause the interchanging of ground and top colors, according to customers preferences.  
Reverse Cycle Defrost. 1. Method of heating evaporator for defrosting purposes. 2. Valves to move hot gas from compressor into evaporator.  
Reverse Engineering. The study and analysis of a product in order to gain information about its design, construction, and use, for designing a new improved version.  
Reverse Thrust Fault. A geological fault under compression where the overlying block moves up the dip of the fault plane.  
Reversible Lock. A lock that will function on doors of either hand, sometimes with slight adjustments.  
Reversing Valve. Device used to reverse direction of the refrigerant flow depending upon whether heating or cooling is desired.  
Reversionary Clause. A provision in a deed that provides for the property to revert to the grantor in the event that any of the restrictions are violated.  
Revibration. The delayed vibration of concrete that has already been placed and consolidated; most effective when done at the latest time a running vibrator will sink of its own weight into the concrete and again make it plastic.  
Revolving Door. Typically a four panel door attached at 90 degrees to each other that turns on a center axis; some are 3 panel attached at 120 degrees to each other.  

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