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Definition of Coordinated universal time

Babylon English

Zulu time
Coordinated universal time Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

coordinated universal time
(utc, world time) the standard time common to every place in the world. utc is derived from international atomic time (tai) by the addition of a whole number of "leap seconds" to synchronise it with universal time 1 (ut1), thus allowing for the eccentricity of the earth's orbit, the rotational axis tilt (23.5 degrees), but still showing the earth's irregular rotation, on which ut1 is based.
coordinated universal time
is expressed using a 24-hour clock and uses the gregorian calendar. it is used in aeroplane and ship navigation, where it also sometimes known by the military name, "zulu time". "zulu" in the phonetic alphabet stands for "z" which stands for longitude zero.

WordNet 2.0

Noun
1. Greenwich Mean Time updated with leap seconds
(synonym) UTC
(hypernym) Greenwich Mean Time, Greenwich Time, GMT, universal time, UT, UT1
(hyponym) Earth-received time, ERT
Coordinated universal time Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
An atomic time scale that is the basis for broadcast time signals. Coordinated Universal Time (UTC) differs from International Atomic Time by an integral number of seconds; it is maintained within 0.9 seconds of UT1 (see Universal Time) by introduction of Leap Seconds. The rotational orientation of the Earth, specified by UT1, may be obtained to an accuracy of a tenth of a second by applying the UTC to the increment DUT1 (where DUT1 = UT1 - UTC) that is broadcast in code with the time signals. Also called UTC. See also International Atomic Time; Universal Time; ZULU Time.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
Coordinated universal time Definition from Science & Technology Dictionaries & Glossaries
Telecommunication Standard Terms
Time scale, based on the second (SI), as defined and recommended by the CCIR, and maintained by the Bureau International des Poids et Mesures (BIPM). For most practical purposes associated with the Radio Regulations, UTC is equivalent to mean solar time at the prime meridian (0° longitude), formerly expressed in GMT. [NTIA] [RR] Note 1: The maintenance by BIPM includes cooperation among various national laboratories around the world. Note 2: The full definition of UTC is contained in CCIR Recommendation 460-4. (188 ) Note 3 : The second was formerly defined in terms of astronomical phenomena. When this practice was abandoned in order to take advantage of atomic resonance phenomena ("atomic time") to define the second more precisely, it became necessary to make occasional adjustments in the "atomic" time scale to coordinate it with the workaday mean solar time scale, UT-1, which is based on the somewhat irregular rotation of the Earth. Rotational irregularities usually result in a net decrease in the Earth's average rotational velocity, and ensuing lags of UT-1 with respect to UTC. Note 4: Adjustments to the atomic, i.e., UTC, time scale consist of an occasional addition or deletion of one full second, which is called a leap second. Twice yearly, during the last minute of the day of June 30 and December 31, Universal Time, adjustments may be made to ensure that the accumulated difference between UTC and UT-1 will not exceed 0.9 s before the next scheduled adjustment. Historically, adjustments, when necessary, have usually consisted of adding an extra second to the UTC time scale in order to allow the rotation of the Earth to "catch up." Therefore, the last minute of the UTC time scale, on the day when an adjustment is made, will have 59 or 61 seconds. Synonyms World Time, Z Time, Zulu Time.
Solar Energy
By international agreement, the local time at the prime meridian, which passes through Greenwich, England. Therefore, it is also known as Greenwich Mean Time, or sometimes simply Universal Time .
WEATHER&METEOROLOGY
The time in the zero degree meridian time zone:
Coordinated universal time Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Coordinated Universal Time , abbreviated as UTC, is the primary time standard by which the world regulates clocks and time. It is, within about 1 second, mean solar time at 0° longitude; it does not observe daylight saving time. It is one of several closely related successors to Greenwich Mean Time (GMT). For most purposes, UTC is considered interchangeable with GMT, but GMT is no longer precisely defined by the scientific community.

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