Definition

Noun: An instrument used to measure altitude, which is the height above a fixed reference point, typically ground level or sea level. It is a crucial device in aviation and other forms of navigation.

Usage

The altimeter is a standard instrument in aircraft cockpits, providing pilots with essential information about their vertical position. It functions by measuring atmospheric pressure, which decreases with increasing altitude.

Examples

• Noun:
  • The pilot checked the altimeter before beginning the descent.
  • Modern aircraft are equipped with highly sensitive altimeters for safety.

Advanced Usage

• "to read the altimeter": To interpret the measurement displayed on the altimeter.
  • The co-pilot is trained to read the altimeter accurately under all conditions.

Variants and Related Words

• Altimetry (n): The science or process of measuring altitude.
  • Satellite altimetry is used to map ocean surface topography.
• Radar altimeter (n): A type of altimeter that uses radio waves to measure height above the terrain directly below.
  • The radar altimeter provides precise readings during the landing approach.

Synonyms

• Height gauge: An instrument for measuring height.
• Elevation meter: A device that determines elevation.

Related Phrases

• "Altimeter setting": The barometric pressure adjustment used to calibrate the altimeter to show correct altitude above a specific datum, like sea level.
  • The air traffic controller provided the new altimeter setting to the incoming flight.

Noun

1. an instrument that measures the height above ground; used in navigation