level

noun:a flat, horizontal surface; a plane that is even and parallel to the horizon
- The carpenter checked that the tabletop was a perfect level before installing it.
noun:the height of something above a reference point, especially sea level
- The village sits at an altitude of 1,200 feet above sea level.
noun:a particular position in a scale or hierarchy
- She was promoted to a senior management level after five years with the company.
noun:the intensity or amount of something, measured on a scale (e.g., noise level, sugar level)
- The noise level in the restaurant was high enough to make conversation difficult.
noun:a tool used to determine whether a surface is horizontal or vertical
- He used a level to make sure the pictures hung perfectly straight on the wall.
verb:to make a surface or object flat, even, or uniform in height
- The workers leveled the ground before laying the foundation.
verb:to bring something down to the ground or destroy it completely (often a building)
- The old warehouse was leveled to make way for a new shopping center.
verb:to adjust something to a particular level or height, such as volume or temperature
- She leveled the thermostat to 72 degrees before leaving the house.
adjective:calm, steady, and not easily agitated; having a balanced temperament
- His level demeanor helped calm the nervous crowd during the emergency.