Context: The minute is a unit of time or of angle. As a unit of time, the minute is equal to (the first sexagesimal fraction) of an hour, or 60 seconds. In the UTC time standard, a minute on rare occasions has 61 seconds, a consequence of leap seconds (there is a provision to insert a negative leap second, which would result in a 59-second minute, but this has never happened in more than 40 years under this system). As a unit of angle, the minute of arc is equal to of a degree, or 60 seconds (of arc). Although not an SI unit for either time or angle, the minute is accepted for use with SI units for both. The SI symbols for "minute" or "minutes" are min for time measurement, and the prime symbol after a number, e.g. 5, for angle measurement. The prime is also sometimes used informally to denote minutes of time., Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future. Time is a component quantity of various measurements used to sequence events, to compare the duration of events or the intervals between them, and to quantify rates of change of quantities in material reality or in the conscious experience. Time is often referred to as the fourth dimension, along with the three spatial dimensions., The International System of Units (; abbreviated as SI) is the modern form of the metric system, and is the most widely used system of measurement. It comprises a coherent system of units of measurement built on seven base units. The system also establishes a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units., The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units (SI). It is qualitatively defined as the "second" division of the hour by sixty, the first division by sixty being the minute. SI definition of second is "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom". Seconds may be measured using a mechanical, electrical or an atomic clock., An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS., The metric system is an internationally agreed decimal system of measurement. It was originally based on the and the introduced by the French First Republic in 1799, but over the years the definitions of the metre and the kilogram have been refined, and the metric system has been extended to incorporate many more units. Although a number of variants of the metric system emerged in the late nineteenth and early twentieth centuries, the term is now often used as a synonym for "SI" or the "International System of Units"the official system of measurement in almost every country in the world., Latin (Latin: ) is a classical language belonging to the Italic branch of the Indo-European languages. The Latin alphabet is derived from the Etruscan and Greek alphabets., The ground state of a quantum mechanical system is its lowest-energy state; the energy of the ground state is known as the zero-point energy of the system. An excited state is any state with energy greater than the ground state. The ground state of a quantum field theory is usually called the vacuum state or the vacuum., A millisecond ( from milli - and second ; symbol : ms ) is a thousandth ( 0.001 or 10  3 or 1/1000 ) of a second . 10 milliseconds ( a hundredth of a second ) are called a centisecond . 100 milliseconds ( one tenth of a second ) are called a decisecond . To help compare orders of magnitude of different times , this page lists times between 10  3 seconds and 100 seconds ( 1 millisecond and one second ) . See also times of other orders of magnitude ., The hour (common symbol: h or hr, h being the international form of the symbol) is a unit of measurement of time. In modern usage, an hour comprises 60 minutes, or 3,600 seconds. It is approximately of a mean solar day., Milli- (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10). Proposed in 1793 and adopted in 1795, the prefix comes from the Latin , meaning "one thousand" (the Latin plural is ). Since 1960, the prefix is part of the International System of Units (SI). , Subject: millisecond, Relation: instance_of, Options: (A) alphabet (B) angle (C) atomic clock (D) base (E) clock (F) component (G) definition (H) degree (I) device (J) energy (K) field (L) field theory (M) language (N) metre (O) metric (P) negative (Q) number (R) point (S) quantity (T) quantum field theory (U) region (V) republic (W) sequence (X) set (Y) seven (Z) standard ([) state (\) symbol (]) synonym (^) system (_) system of measurement (`) term (a) three (b) time (c) time standard (d) unit of angle (e) unit of time (f) wave
Output: unit of time