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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.
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.
Jul 4, 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, the International Bureau of Weights and Measures, and the speed of light.
- The Editors of Encyclopaedia Britannica
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.
noun. a metric unit of length equal to approximately 1.094 yards. the basic SI unit of length; the length of the path travelled by light in free space during a time interval of 1/299 792 458 of a second.
Metre is a unit of length in the metric system, equal to 100 centimetres or approximately 1.094 yards. It is also the name of a poetic device based on the number of syllables in each line.
Learn the meaning, pronunciation and usage of metre, a unit of length and a poetic rhythm. See examples, synonyms and related topics in the Oxford Learner's Dictionary.
