Related Words

Above Ground Level (AGL): Altitude expressed as feet above the ground or terrain. It is usually set to indicate the airport field elevation during the pre-takeoff checklist.

Lowest-Observed-Adverse-Effect Level (LOAEL): The lowest tested dose of a substance that has been reported to cause harmful (adverse) health effects in people or animals.

Mean Diurnal Tide Level (MDTL): A tidal datum. The arithmetic mean of mean higher high water and mean lower low water.

Low Level Jet (LLJ): Strong winds that are concentrated in relatively narrow bands in the lower part of the atmosphere. It is often amplified at night. The southerly wind over the US Plains states during spring . . . View Full Definition

Loan Forfeiture Level: The lowest market price that a processor must receive before concluding that forfeiting pledged sugar to the Commodity Credit Corporation is more profitable than selling the sugar. In practi . . . View Full Definition

Line-Level: Standard +4 dbu or -10 dbv audio levels. Used in communicating standard signals between processing devices, such as : receiver to equalizer, or equalizer to amplifier.

Mean River Level: A tidal datum. The average height of the surface of a tidal river at any point for all stages of the tide observed over the National Tidal Datum Epoch. It is usually determined from hourly h . . . View Full Definition

Mean Sea Level (MSL): A tidal datum. The arithmetic mean of hourly heights observed over the National Tidal Datum Epoch. Shorter series are specified in the name; e.g., monthly mean sea level and yearly mean sea level.

Mean Water Level Line (MWLL): The line on a chart or map which represents the intersection of the land with the water surface at the elevation of mean water level.

Melting Level: The altitude at which ice crystals and snow flakes melt as they descend through the atmosphere.