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Hecto or hecta is a decimal unit prefix in the metric system denoting a factor of one hundred.It was adopted as a multiplier in 1795, and comes from the Greek á¼ÎºÎ±ÏÏÎ½ hekaton, meaning hundred.Based on a proposal by Thomas Young, the prefix was often alternatively spelled hecato-in early 19th century sources. Its unit symbol as an SI prefix in the International System of Units (SI) is the lower case letter h.t was adopted as a multiplier in 1795, and comes from the Greek á¼ÎºÎ±ÏÏÎ½ hekaton, meaning hundred. Based on a proposal by Thomas Young, the prefix was often alternatively spelled hecato-in early 19th century sources.
1. Prefix denoting straight, normal, in proper order. 2. In chemistry, italicized prefix denoting that a compound has two substitutions on adjacent carbon atoms in a benzene ring. For terms beginning ortho- or o-, see the specific name.