On Center (O/C) 0 likes

Also referred to as center to center

On the Stump 0 likes

See Standing Timber

On-Site 0 likes

Items and activities occurring on the job site

One Piece Toilet2 likes

A toilet in which the water tank and the bowl are molded in a single piece of vitreous china for aesthetic purposes and quiet functioning

One-Family Dwelling 0 likes

A place of dwelling consisting of only a single dwelling

One-Way 0 likes

In a single direction only

One-Way Action 0 likes

Structural effect of a slab between two bearing walls or between two parallel beams

One-Way Concrete Joist System 0 likes

A strong framing system made of concrete where concrete joists are spaced near each other between parallel beams or bearing walls

One-Way Glass 0 likes

See Transparent Mirror

One-Way Solid Slab 0 likes

A concrete roof slab or floor set between parallel beams or walls, with structural reinforcement in one direction

Opacity 0 likes

Lacking transparency, such as in paint

Opaque 0 likes

Lacking transparency; not able to be seen through

Opaque Glaze 0 likes

A glaze that is not transparent, with or without color

Open Bid/Estimate 1 like

A person or entity requests bids or estimates from service providers prior to qualifying them. Contractors can see and bid on project-specific information in the request for proposal (RFP)

Open Circuit 0 likes

An incomplete electric circuit disrupted via a switch, open breaker, fuse or a break in a conductor

Open Compressor1 like

A type of external drive compressor that is not airtight

Open Decking 0 likes

When the joists underneath a deck are visible and unprotected

Open Display Case 0 likes

An open refrigerator case for displaying items commercially; keeps contents at cool temperatures

Open Front Seat1 like

A type of toilet seat used in public toilets; has an opening in the front

Open Hole Inspection 0 likes

An engineer or municipal supervisor examines an excavation to decide upon an appropriate foundation to fill the hole

Open Listing 0 likes

A property owner makes a non-exclusive agreement with one or more real estate agents to sell or lease a property

Open Run-Around 0 likes

A way of recovering heat from exhaust air by including a fluid into the supply and exhaust air streams alternately, thus transferring latent and sensible heat

Open Time 0 likes

A specific time frame in which a bond coat is able to stick to a tile and fasten the tile to a substrate

Open Type Compressor 0 likes

See Compressor, Open Type

Open Type Decking 0 likes

When the joists underneath a deck are visible and unprotected

Open-Graded Aggregate 0 likes

An aggregate which contains almost no mineral filler; the void spaces are quite large

Open-Graded Asphalt Friction Course 1 like

A skid-resistant surface course that thwarts hydroplaning by enabling rainwater to drain rapidly through the course and exit the shoulder; this largely void asphalt mixture is composed mainly of coarse aggregate of a single size

Open-Grained Wood 0 likes

Types of wood with sizeable pores including ash, walnut and oak; also known as Coarse Textured or Coarse-Grained

Open-Web Steel Joist 0 likes

Welded assembled steel joist employed at close distances from each other to reinforce floor or roof decking

Operable Door 0 likes

One of two doors that usually functions

Operable Part 0 likes

A component of equipment or an appliance such as a coin slot or handle, used to insert or withdraw objects, start, stop or modify it

Operating Instructions 0 likes

A booklet or sheets with written directions and descriptions for the proper operation of equipment or components; provided by the manufacturer

Operating Leverage 0 likes

The ratio of the profit percentage change to the sales percentage change, measuring how revenue growth translates into growth in operating income

Operating Pressure 1 like

Positive or negative (vacuum) pressure at which a refrigerating system normally operates

Operating Profit 0 likes

A business’ earnings minus all operating expenses of a business; also known as Earnings Before Interest and Tax (EBIT) or Operating Income

Operating Room 0 likes

A hospital room especially designed and equipped for surgeries

Operation Expenses 0 likes

Total expenditure for a project or business; includes the cost of products, general and administrative expenses and any indirect expenses

Opposed Blades 0 likes

A damper with two sets of blades which are connected in a way that the adjacent blades are able to open and spin in opposing directions

Option 0 likes

A choice or alternative

The right to buy, sell, or lease an item, which is kept open for consideration for a certain length of time

Optionee 0 likes

A person who is given an option

The potential buyer or lessee in a real estate option

Optionor 0 likes

The person who offers an option

In a real estate option, the owner or lessor who wants to sell or lease

Or Equal 0 likes

Used in instructions or specifications to stipulate that any substitutions must be equivalent to the original

Oral Agreement 0 likes

A contract that has been agreed to verbally rather than in writing

Orange Mineral 0 likes

Red lead which is made by baking basic carbonate white lead; mainly employed for printing ink

Orange Peel 0 likes

The pocked texture of a fired glaze which looks like an orange peel‘s surface

Defect in spray painting in which the lacquer coat does not smooth out but remains coarse; similar to when an orange peel is peeled

Orbital Sander1 like

A hand-held power sander that moves in a circular orbit

Ordinance 0 likes

A city or a county law

Ore 0 likes

Rock or other naturally occurring solid mineral that contains extractable quantities of metals or minerals of commercial value

Organic 0 likes

A chemical compound that has carbon

Consisting of hydrocarbons or derivatives thereof, or matter of biological origins

Relating to or derived from living matter

Organic Adhesive 0 likes

An adhesive prepared from naturally occurring organic material that does not require more liquid or powder, used for attaching tile to back-up material with the thin set method; sets by evaporating

Organosol 0 likes

Film that has synthetic resin plasticizer and solvent; the spreading of resin particles in a mixture which has in excess of five percent volatile content

Oriel Window 0 likes

A type of bay window which is supported by corbels or brackets and projects out from a wall

Oriented Strand Board or OSB 0 likes

A fabricated 4 feet by 8 feet wooden board that is composed of 1 inch to 2 inch wood chips and adhesive, and frequently used instead of plywood

Orifice 1 like

An opening

An attachment for the nozzle of a plastering machine hose; can vary in shape and size, and may be modified to create a pattern on the plaster while it is cast onto a given surface

An opening of a furnace or boiler through which fuel is expelled

Original Contractor 0 likes

A contractor who works directly with a real property owner

Ormolu 0 likes

Gilded bronze or gold amalgam of copper, zinc and tin; used in furniture decorations and ornaments

Ornament1 like

Something used to adorn or decorate

Ornamental Facing 0 likes

A design made by positioning stone, brick, tile and other masonry items in a decorative manner in masonry

Ornamental Metal1 like

A feature on a metal structure to embellish or decorate the appearance

Ornate 0 likes

Intricately adorned; extremely decorated

Orthogonal 0 likes

Involving right angles; at right angles, perpendicular

Orthographic Projection 0 likes

A two-dimensional representation of an object on paper or other surface; the projection is at right angles to both the view and the projection lines, as in floor plans, and sections of homes

Orthotropic 0 likes

With different characteristics or strengths in mutually perpendicular symmetry planes; a particular type of anisotropy