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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.
Apr 12, 2024 · Metre is the fundamental unit of length in the metric system and the International Systems of Units. Learn how it was defined by the French Academy of Sciences, the International Bureau of Weights and Measures, and the speed of light.
- The Editors of Encyclopaedia Britannica
Metre is a unit of length in the metric system, equal to 100 centimetres. It is also a unit of poetry and music, and a word for meter in American English.
Learn the different meanings and uses of the word meter, from a unit of length to a rhythmic pattern in poetry and music. See synonyms, examples, word history, and related articles.
Learn the meaning, pronunciation and usage of the word metre in English. Find out how to measure length, count metres in races, and identify metre in poetry.
meter. 2. The basic unit of length in the metric system; it was originally planned so that the circumference of the Earth would be measured at about forty million meters. A meter is 39.37 inches. Today, the meter is defined to be the distance light travels in 1 / 299,792,458 seconds.
A metre (US spelling, meter) is the basic unit of length in the SI measurement system. The symbol for the metre is m. The first meaning (in the French Revolution) was one ten-millionth of the distance between the Earth's equator and the North Pole along the Paris meridian.
