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Hectometer or hectometre is a measurement of distance. It is equal to 100 meters. It is a uncommonly used unit of length in the metric system. Plural name is hectometers.
Gigameter or gigametre is equal to 1,000,000,000 meters or 106 meters (unit of length), comes from a combination of the metric prefix giga (G) and the SI unit of length meter (m). Plural name is gigameters.