"Cislunar" refers to the space or region between the Earth and the Moon. It describes the area where all the space missions to the Moon take place. Full definition
NASA's Deep Space Gateway would serve as an international hub in orbit around the Moon; available to partner agencies from around the world as well as commercial ventures active in cislunar space. (spaceangels.com)
The MBC space station would consist of multiple separate components, some of which would be launched straight from Earth, while others might undergo some construction in cislunar space. (scientificamerican.com)
But first Congress wants a station or infrastructure in Lunar orbit to support / enhance Orion cislunar operations. (americaspace.com)