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me·ter2  audio  (mtr) KEY 

NOUN:
Abbr. m
The international standard unit of length, approximately equivalent to 39.37 inches. It was redefined in 1983 as the distance traveled by light in a vacuum in 1/299,792,458 of a second. See Table at measurement.

ETYMOLOGY:
French mètre, from Greek metron, measure; see m-2 in Indo-European roots


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