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The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1 / 299 792 458 of a second, where the second is defined by a hyperfine transition frequency of caesium.
4, is assumed to either be equivalent to a measure of 3 4 followed by a measure of 2 4, or the opposite: 2 4 then 3 4. Higher metres which are divisible by 2 or 3 are considered equivalent to groupings of duple or triple metre measures; thus, 6 4, for example, is rarely used because it is considered equivalent to two measures of 3 4.
In ancient Greek, the word μέτρον had a variety of meanings. The basic meaning is the "measure, size, length" of something. [7] Another meaning is "metre" or "verse", for example λὀγους εἰς μέτρα τιθέντες (logous eis métra tithéntes) "putting words into verse" (); a μετρικός is an expert in metre.
Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [1] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.
The base unit in the International System of Units (SI) is the meter, defined as "the length of the path travelled by light in vacuum during a time interval of 1 ⁄ 299792458 seconds." [ 9 ] It is approximately equal to 1.0936 yd .
In poetry, metre (Commonwealth spelling) or meter (American spelling; see spelling differences) is the basic rhythmic structure of a verse or lines in verse. Many traditional verse forms prescribe a specific verse metre, or a certain set of metres alternating in a particular order.
The English word "trapeze" is an example of an iambic pair of syllables, since the word is made up of two syllables ("tra-peze") and is pronounced with the stress on the second syllable ("tra-PEZE", rather than "TRA-peze"). A line of iambic pentameter is made up of five such pairs of short/long, or unstressed/stressed, syllables.
A metrical foot (aka poetic foot) is the basic repeating rhythmic unit that forms part of a line of verse in most Indo-European traditions of poetry.. In some metres (such as the iambic trimeter) the lines are divided into double feet, called metra (singular: metron).