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Cis is a Latin word meaning "on the same side" and is the opposite of trans. Its uses include:

• In chemistry, a double bond in which the greater radical on both ends is on the same side of the bond is called cis. Compare with trans. In the example shown on the right, both hydrogen molecules, (and both fluorine molecules) are on the same side of the carbon chain. As the carbons are joined by a double bond, these cannot rotate around the molecule. ;;See also Geometric isomerism.

• In genetics, cis- is a prefix used in terms such as "cis-regulation" to signify the co-location of two or more genes on the same chromosome of a homologous pair.

• In mathematics, cis x is a now rarely used abbreviation for cos x + i sin x, which is equal to e^ix (see Euler's formulaThis article is about the Euler's formula in complex analysis . There is also Euler's formula which is related to the Euler characteristic in algebraic topology. Euler's formula named after Leonhard Euler, is a mathematical formula in the subfield of comp).

• In geographyGeography is the scientific study of the locational and spatial variation in both physical and human phenomena on Earth. The word derives from the Greek words g ("the Earth") and graphein ("to write," as in "to describe"). Geography is also the title of v, there are several pairs of places beginning Cis and Trans, including CiskeiCiskei was a Bantustan in the south east of South Africa. In 1961 it became a separate administrative region and in 1972 was declared "self-governing" under the rule of Lennox Sebe. It was designated as a homeland for Xhosa speaking people and in the 1970 and TranskeiTranskei the former republic-in-name and black Bantustan, situated in what is now part of Eastern Cape Province, South Africa, bordered by the Umtamuuma River in the north and the Great Kei river in the south, while the Indian Ocean and the Drakensberg Mo in South AfricaSouth Africa is a republic at the southern tip of Africa. It is bordered to the north by Namibia, Botswana and Zimbabwe, to the north-east by Mozambique and Swaziland. Lesotho is contained entirely inside the borders of South Africa. South Africa is one o, and Cisalpine GaulProvince of the Roman Republic, in modern-day northern Italy. It was Rome's third province (after Sicily and Corsica), and was merged into Italia in 42 BC, as part of Octavian's 'Italicisation' program during the Second Triumvirate. Julius Caesar used Gal and Transalpine Gaul .