plasma

This term is defined in ECSS-E-ST-10-04C as
partly or wholly ionized gas whose particles exhibit collective response to magnetic and electric fields

This term is defined in ECSS-E-ST-10-12C as
partly or wholly ionised gas whose particles exhibit collective response to magnetic or electric fields

This term is defined in ECSS-E-ST-20-06C as
partly or wholly ionized gas whose particles exhibit collective behaviour through its electromagnetic field

This term is defined in ECSS-E-ST-35C Rev. 1 as
ionized gas