The metre, or meter (American spelling), (from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI). The SI unit symbol is m. The metre is defined as the distance travelled by light in a specific fraction (1/299 792 458) of a second.
近义、反义、联想词
近义词
n.
metric linear unit, measuring instrument, measuring system, measuring device, poetic rhythm, rhythmic pattern, prosody