Cis may have the following meanings: "Cis-" as a prefix of Latin origin, meaning "on the same side [as]" or "on this side [of]", with several derived usages: In chemistry, cis- refers to cis-trans isomerism In molecular biology, cis- refers to cis-acting In gender studies, cis- refers to cisgender In music, cis is another name for C-sharp In the mathematics of complex numbers, cis θ is an abbreviation for cos θ + i·sin θ Cis, Italy, a commune in the province of TrentoCis, &… (More on Cis)