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| Open occupancy
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Housing where purchase or lease is available to everyone regardless of race, ethnic origin, color or religion and affirmative action is actively pursued. |
| Open pollinated
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Plants pollinated by natural plant movement, wind, or insect activity, not controlled by man. |
| Open space
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Land, which is left undeveloped for use as parks, walking paths, etc., by those living in a planned community. |
| Open space ratio
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The ratio, in a development, of open space to developed land. |
| Open string stairs
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A staircase where at least one end of the treads is visible. |
| Open time
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The time after an adhesive has been applied and permitted to cure when the two surfaces can be bonded. |
| Open valley
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Method of valley construction in which shingles on both sides of the valley are trimmed along a chalk line snapped on each side of the valley. Shingles do not extend across the valley. Valley flashing is exposed. |
| Open web joist
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A metal joist where the edges are reinforced by a lightweight structural steel in a zigzag pattern, creating a strong yet lightweight framing member. |
| Open-circuit voltage
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The maximum possible voltage across a photovoltaic cell; the voltage across the cell in sunlight when no current is flowing. |
| Open-end block
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Concrete block, which has an end removed so that it can be placed around vertical steel reinforcement. |
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