'Meter' and 'Metre' are two spellings of the same base word, but they are used differently depending on the context and the variety of English.
The metre is the base unit of length in the SI (International System of Units). It is defined as the distance light travels in a vacuum in 1/299,792,458 of a second.
| Meter (American English) | Metre (British English) | |
|---|---|---|
| Unit of length | Meter ✓ | Metre ✓ |
| Measuring device | Meter ✓ | Meter ✓ |
Key rule:
India follows British English conventions in education. So in Indian school textbooks and CBSE/NCERT books, the correct spelling for the unit of length is metre (not meter).
However, in casual use and signboards in India, both spellings are seen.
In India (following British English), **kilometre** is the preferred spelling. In American English, 'kilometer' is used.
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