: the base unit of length in the International System of Units that is equal to the distance traveled by light in a vacuum in ¹/₂₉₉,₇₉₂,₄₅₈ second or to about 39.37 inches see Metric System Table
Middle English metre, borrowed from Anglo-French & Latin; Anglo-French, borrowed from Latin metrum, borrowed from Greek métron "measure, space measured, (in plural) proportions, poetic meter," perhaps going back to Indo-European *mh1-tro-, zero-grade derivative of a verbal base *meh1- "measure" — more at measure entry 1
Note: The word meter in the sense "poetic meter" is attested twice in Old English as a borrowing from Latin, but there is no continuity between this use and occurrence in later Middle English.
borrowed from French mètre, borrowed from Greek métron "measure" — more at meter entry 1
Noun (4)
probably originally, as short for gas-meter "instrument for measuring the quantity of gas passing through an outlet," to be identified with meter entry 2; later uses appear to be extracted from compounds with -meter, generalized to refer to any measuring device
borrowed from French & New Latin; French -mètre, borrowed from New Latin -meter, borrowed from Greek -metron (as in hodómetron "instrument for measuring distance, odometer"), from métron "measure, instrument for measuring" — more at meter entry 1
Note: The earliest of such New Latin compounds is perhaps altimeteraltimeter.
First Known Use
Noun (1)
before the 12th century, in the meaning defined at sense 1a