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	Eng ID	Term	Definition
	5441	threshold	In aeronautical terminology, the beginning of that portion of the RUNWAY usable for landing.
	5442	threshold speed	The minimum SPEED of CURRENT at which a particular CURRENT METER will measure at its rated reliability.
	5443	thunder	Sharp or rumbling SOUND which accompanies LIGHTNING.
	5444	thunderstorm	One or more sudden electrical discharges manifested by the flash of light (LIGHTNING) and a sharp or rumbling sound (THUNDER).
	5445	tidal basin	See BASIN.
	5446	tidal bore	See BORE.
	5447	tidal constants	Tidal relations that remain essentially constant for any particular locality. Tidal constants are classed as harmonic and non-harmonic, th... more Tidal relations that remain essentially constant for any particular locality. Tidal constants are classed as harmonic and non-harmonic, the HARMONIC CONSTANTS consisting of the AMPLITUDES and EPOCHS, and the NON-HARMONIC CONSTANTS including those values determined directly from OBSERVATIONS, such as tidal ranges and intervals.
	5448	tidal constituent	See HARMONIC CONSTITUENT.
	5449	tidal current	See CURRENT.
	5450	tidal current chart	See CHART.
	5451	tidal current signal	See SIGNAL.
	5452	tidal (or tide) cycle	A complete set of tidal conditions, as those occurring during a TIDAL DAY, LUNAR MONTH or METONIC CYCLE.
	5453	tidal datum	See DATUM.
	5454	tidal day	LUNAR DAY. The period of the daily CYCLE of the TIDES, differing slightly from the LUNAR DAY because of PRIMING and LAGGING OF THE TIDE.
	5455	tidal difference	Difference in TIME or HEIGHT of a HIGH or LOW WATER at a SUBORDINATE STATION and at a REFERENCE STATION for which predictions are given in t... more Difference in TIME or HEIGHT of a HIGH or LOW WATER at a SUBORDINATE STATION and at a REFERENCE STATION for which predictions are given in the TIDE TABLES. The difference, when applied according to sign to the prediction at the REFERENCE STATION, gives the corresponding TIME or HEIGHT for the SUBORDINATE STATION.
	5456	tidal epoch	See PHASE LAG.
	5457	tidal flat	A MARSH or sandy or muddy coastal flatland which is covered and uncovered by the RISE and fall of the TIDE.
	5458	tidal harbour	See HARBOUR.
	5459	tidal light(s)	See LIGHT.
	5460	tidal movement	The movement which includes both the vertical RISE and fall of the TIDE, and the horizontal FLOW of the TIDAL CURRENTS. This movement is ass... more The movement which includes both the vertical RISE and fall of the TIDE, and the horizontal FLOW of the TIDAL CURRENTS. This movement is associated with the astronomical TIDE-PRODUCING FORES of the MOON and SUN acting upon the rotating EARTH.
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