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Term Definition
Advancing Colors. Colors that give an illusion of being closer to the observer; warm colors in which red-orange predominates.  
Adverse Possession. The overt occupation of real property under some claim of right that is opposed to the claim of some other claimant.  
Advertisement for Bids. Published notice for receiving of bids for a construction project.  
Advisor CM. A construction manager who is an advisor to the owner and who does not guarantee the construction cost.  
Adze. A tool for cutting away the surface of wood, like an axe with an arched blade at right angles to the handle.  
Aerate. To introduce air into a substance, such as into water at the kitchen sink.  
Aeration. Act of combining substance with air.  
Aerator. Device which adds air to water; fills flowing water with bubbles.  
Aerembolism. Caisson Desease.  
Aerial . 1. Relating to the air or atmosphere. 2. An antenna.  
Aerobic. Activities or processes that can take place only in the presence of air or oxygen.  
Aerosol. 1. A colloidal suspension of fine solid or liquid particles in gas, like smoke, fog, and mist. 2. A substance dispensed from a pressurized can in aerosol form.  
Aesthetic Effect. Relating to the beautiful rather than to the merely pleasing, useful, or utilitarian; artistic and in accordance with the principles of good taste.  
Aesthetics. Concerned with beauty, refinement, and good taste.  
AEV. Automatic Expansion Valve.  
Affidavit. A written statement that is made under oath.  
AFPA (Formerly NFoPA). American Forest & Paper Association.  
A-Frame. A building structure where the main structural members forming the roof and floors are in an A-shape.  
Aftershock. An earthquake occurring subsequent to a large earthquake, the main shock; the magnitude of an aftershock is usually smaller than the main shock.  
AGA. American Gas Association.  
AGC. Associated General Contractors of America.  
Agent. One who acts with delegated authority for a principal.  
Agglomeration. Formation of masses or aggregates of pigments; not dispersed.  
Aggregate Coated Panel. Sheet material, usually plywood, with decorative face of aggregate bonded with epoxy applied to one face.  
Aggregate Storage Bins. In a concrete batching plant, the bins that store the necessary aggregate sizes and feed them to the dryer in substantially the same proportions as are required in the finished mix.  
Aggregate, Coarse. One of the four ingredients of concrete, usually gravel, which is retained on a #4 sieve.  
Aggregate, Fine. One of the four ingredients of concrete, usually sand, which will pass the #4 sieve and will be retained on the #200 sieve.  
Aggregate, Heavyweight. Aggregate of high specific gravity such as barite, magnetite, limonite, limenite, iron, or steel used to produce heavy concrete.  
Aggregate, Lightweight. Aggregate of low specific gravity, such as expanded or sintered clay, shale, slate, diatomaceous shale, perlite, vermiculite, or slag; natural pumice, scoria, volcanic cinders, tuff, and diatomite, sintered fly ash, or industrial cinders; used to produce lightweight concrete; aggregate with a dry, loose weight of 70 pounds per cubic foot or less.  
Aggregate. 1. Inert particles such as sand, gravel, crushed stone, or expanded materials, in a concrete, plaster, or terrazzo mixture. 2. Granular material, such as sand, gravel, crushed stone, and iron blast-furnace slag, used with a cementing medium to form a hydraulic-cement, concrete or mortar. 3. Crushed stone, crushed slag, or water-worn gravel used for surfacing a built-up roof. 4. Any granular mineral material.  

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