- (initialism) . Commonwealth of Independent States.
- (initialism) . (Canada) (sports) Canadian Interuniversity Sport.
- Adjective. (biology) Having two mutations on two genes on the same chromosome of a homologous pair.
- Adjective. (chemistry) (properly cis-) Describing a double bond in which the greater radical on both ends is on the same side of the bond.
- Adjective. (context, LGBT) Not trans (transgender or transsexual); cisgender or cissexual.