- Maintain. To keep a system, facility, area, or activity in continuously sound condition, as defined by approved standards.
- Mansionization. Term used to describe residential building additions, or building replacements which lack compatibility with the scale and character of the surrounding neighborhood. Typically such additions, or replacements are constructed in conformance with existing development regulations.
- Master Plan of Arterial Highways (MPAH). The MPAH establishes a system of countywide arterial highways for long-range transportation planning in Orange County. This plan requires interagency coordination for a variety of street types to ensure safe and efficient transportation.
- May. To offer the possibility but not the probability or promise of a certain commitment of resources or support; associated with action or activity that is often desirable and allowed, but implementation of such action or activity is often conditional.
- Minimize. To reduce something to the smallest amount or degree feasible.
- Ministerial. An action taken by a governmental agency that follows established procedures and rules and does not call for the exercise of judgment in deciding whether to approve a project.
- Mitigation measures. Conditions imposed upon a project with the intent of avoiding, or minimizing, the potential negative impact of the project.
- Mixed use. Type of development which allows a combination of land uses within a single development.
- Monitor. To track the performance of a particular physical condition, activity accomplishment or aspect of change, with a view toward using the results to inform future actions and commitments.
- Mutual aid. Mutual aid is assistance that, based on a contractual agreement, is dispatched on an as-needed and requested basis between two emergency service departments, communities, or districts when an emergency occurs. It differs from automatic aid, which is dispatched automatically.