Trans is a Latin word meaning "across", "beyond" or "on the opposite side" and is the opposite of cis, which means "on the same side".

• In chemistry, a bond not subject to free rotation in which the greater radical on both ends is on the opposite side of the bond is called trans. Compare with cis.

In the diagram on the right, the hydrogen atoms are on opposite sides of the double bond. They cannot rotate to the same side of the molecule, as (unlike with a single bond) double bonds prevent this from happening. A similar phenomenon is seen in cyclic compounds (in which the atoms form a closed ring), where substituents can be on the same "face" of the ring (cis) or opposite faces (trans.)

See geometric isomerism for more on this topic. See also Trans fat.

• In the gay and lesbian community, the adjective or prefix trans is used to mean transsexual or transgender.
• In geography, placenames beginning with the prefix Trans- convey the meaning "beyond" or "across" something. Examples include Transkei (referring to the Kei River), Transvaal (Vaal River), Transleithania (Leitha), Transmuraland (Mura), Transoxiana (Oxus), Transsiberian (Siberia), Transalpine Gaul (Alps), Transjordan (a historical country in the Middle East), Transcaucasus (Caucasus mountains). The antonym is Cis-.

Trans is also:

• an airline, Trans World Airlines, or TWA.
• Trans, a commune in the Mayenne département, in France;
• Trans-en-Provence, a commune in the Var département, in France;
• commonly used as a short form of transsexual or transgendered, e.g. a transwoman, transman, transpeople. The term also serves as an umbrella term to include the entire trans community, although some (such as genderqueer and other gender variant people) do not use labels with the prefix;
• Trans (album) 1982 album by Neil Young;

• Trans fat

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