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 measured from a fix, predetermined reference level. It is used as a basis for determining elevations, as the reference for all altitudes in upper air measurements, and as the level above which altitude is measured by a pressure altimeter for aviation. Often referred to as MSL.
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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 Adjective Synonyms: denote, signify, indicate, note, specify, designate, represent, betoken, signal, carry, convey, drive at, refer to, allude to, communicate, express, bring out, get over or across, imply, suggest, connote, intimate, hint (at)
Mean Verb Synonyms: portend, show, foretell, foreshadow, promise, presage, augur, herald
Mean Noun Synonyms: intend, design, purpose, plan, aim, have in mind, contemplate, have in view, want, wish, expect, hope, be motivated by, have as justification
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Sea Adjective Synonyms: ocean, deep blue sea, high seas, (briny) deep, (bounding) main, Neptune's or Poseidon's kingdom or domain, blue water, Davy Jones's locker, briny, drink, pond (= 'Atlantic Ocean')
Sea Verb Synonyms: swell, breaker, wave
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Science / Tides and Currents / Relative Mean Sea Level Change: A local change in mean sea level relative to a network of bench marks established in the most stable and permanent material available (bedrock, if possible) on the land adjacent to the tide station lo MORE
Science / Weather / Sea Level Pressure: The atmospheric pressure at mean sea level, usually determined from the observed station pressure. MORE
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