A meter is currently defined as the length of the path travelled by light in vacuum during a time interval of 1 / 299,792,458 of a second.
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A meter is defined as the distance travelled by light in free space in 1/299,792,458th of a second.
meter
From Wikipedia: "Since 1983, [the metre] is defined as the distance travelled by light in vacuum in 1⁄299,792,458 of a second." This is the currently used definition.
One meter is equal to exactly one meter. This is because a meter is a unit of length in the metric system, defined as the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second. Therefore, one meter is always equal to one meter by definition.
A metre is 3 feet 3 inches. The average height of a grown man is around 1.7 meters. A meter is defined as the distance light travels in a vacuum in 1⁄299,792,458 of a second.