Definitions for unit of time
unit of time

Princeton's WordNetRate this definition:0.0 / 0 votes

1. time unit, unit of timenoun

   a unit for measuring time periods

WikipediaRate this definition:0.0 / 0 votes

1. Unit of time

   A unit of time is any particular time interval, used as a standard way of measuring or expressing duration. The base unit of time in the International System of Units (SI) and by extension most of the Western world, is the second, defined as about 9 billion oscillations of the caesium atom. The exact modern SI definition is "[The second] is defined by taking the fixed numerical value of the cesium frequency, ΔνCs, the unperturbed ground-state hyperfine transition frequency of the cesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s−1."Historically, many units of time were defined by the movements of astronomical objects. Sun-based: the year was the time for the Earth to revolve around the Sun. Historical year-based units include the Olympiad (four years), the lustrum (five years), the indiction (15 years), the decade, the century, and the millennium. Moon-based: the month was based on the Moon's orbital period around the Earth. Earth-based: the time it took for the Earth to rotate on its own axis, as observed on a sundial. Units originally derived from this base include the week (seven days), and the fortnight (14 days). Subdivisions of the day include the hour (1/24 of a day), which was further subdivided into minutes and finally seconds. The second became the international standard unit (SI units) for science. Celestial sphere-based: as in sidereal time, where the apparent movement of the stars and constellations across the sky is used to calculate the length of a year.These units do not have a consistent relationship with each other and require intercalation. For example, the year cannot be divided into twelve 28-day months since 12 times 28 is 336, well short of 365. The lunar month (as defined by the moon's rotation) is not 28 days but 28.3 days. The year, defined in the Gregorian calendar as 365.2425 days has to be adjusted with leap days and leap seconds. Consequently, these units are now all defined for scientific purposes as multiples of seconds. Units of time based on orders of magnitude of the second include the nanosecond and the millisecond.

ChatGPTRate this definition:0.0 / 0 votes

1. unit of time

   A unit of time is a standard length or duration used to measure the passage or progression of time. This could include seconds, minutes, hours, days, weeks, months, and years. It provides a standard for comparisons, scientific studies, daily planning, and numerous other activities that involve the marking or measuring of time. The most fundamental unit of time is usually the second, as defined by international scientific standards.

Editors ContributionRate this definition:0.0 / 0 votes

1. unit of timeadjective

   Amount of time

   A unit of time could be an hour or a day

   
   

   Submitted by MaryC on March 2, 2023  

Matched Categories

1. • Measure

How to pronounce unit of time?

1. Alex

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   British

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   Australian

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How to say unit of time in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of unit of time in Chaldean Numerology is: 9

2. Pythagorean Numerology

   The numerical value of unit of time in Pythagorean Numerology is: 6

Examples of unit of time in a Sentence

1. Dr. Lillian Troll:

   Always have some project under way . . . an ongoing project that goes over from day to day and thus makes each day a smaller unit of time.

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=unit of time
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Unit_of_Time
3. ^ ChatGPT
   https://chat.openai.com