Flight Level (FL)

Technology / Aviation / Flight Level (FL): A level of constant atmospheric pressure related to a reference datum of 29.92 inches of mercury. Each is stated in three digits that represent hundreds of feet—flight level 250 represents a barometric altimeter indication of 25,000', flight level 255 as 25,500'.

Other Words for Flight

Flight Noun Synonyms: flying, soaring, winging, excursion
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Other Words for Level

Level Adjective Synonyms: even, smooth, plane, uniform, plain, flat, flush, straight, true
Level Verb Synonyms: aim, point, draw a bead, direct, train, focus
Level Noun Synonyms: horizontal, prone, supine
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Mean Sea Level (MSL)

Technology / Aviation / Mean Sea Level (MSL): The average height of the surface of the sea for all stages of tide: used as a reference for elevations, and differentiated from AGL. MORE

Mean Sea Level

Science / Weather / Mean Sea Level: The average height of the sea surface water level. For the United States, it is computed by averaging the levels of all tide stages over a nineteen year period, determined from hourly height readings MORE

Mean River Level

Science / Tides and Currents / 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 height read MORE

Mean Diurnal Tide Level (MDTL)

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

Mean Tide Level (MTL)

Science / Tides and Currents / Mean Tide Level (MTL): A tidal datum. The arithmetic mean of mean high water and mean low water. Same as half-tide level. MORE

Mean Water Level (MWL)

Science / Tides and Currents / Mean Water Level (MWL): A datum. The mean surface elevation as determined by averaging the heights of the water at equal intervals of time, usually hourly. Mean water level is used in areas of little or no range in tide. MORE

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