- Objective. A specific condition or state that is an intermediate step toward attaining a goal.
- Obstruction. Any object of natural growth, terrain or permanent or temporary construction or alteration including equipment or materials used therein, the height of which exceeds the standards established in Subpart C of Federal Aviation Regulations Part 77, Objects Affecting Navigable Airspace.
- Open Space. Recreational and green spaces, including parks, commercial open space, manicured landscaped areas, and public facilities such as trail corridors, water channels and rail infrastructure.
- Opportunity Zones. An Opportunity Zone is an area designated under the Tax Cuts and Jobs Act of 2017, where new investments, under certain conditions, may be eligible for preferential tax treatment. Opportunity Zones are an economic development tool—that is, they are designed to spur economic development and job creation in distressed communities.
- Overdraft. The condition of a groundwater supply in which the average annual amount of water withdrawn by pumping exceeds the average annual amount of water replenishing the aquifer in any ten year period, considering all sources of recharge and withdrawal.