what do you mean by osmission Share with your friends Share 0 Kamalnain Kaur answered this the action of excluding or leaving out someone or something is known as osmission. hope it helps you sumana 0 View Full Answer Srijita Chakravarty answered this LEAVING OUT SOMETHING 0 Abc answered this The movement of water molecules through a semi permeable membrane is known as osmosis 0 Vivek Nair answered this i think so OSMISSION MEANS:the action of excluding or leaving out someone or something. 0 Arshia Sammauria answered this something that has not been included or done 0 Lehar Ahluwalia answered this to omit. 0 Sinchana answered this Apathy toward, or neglect of, duty resulting in something not properly done or remaining undone. 0 Ishan answered this To omit something or someone is called osmission 1