GI

I. adjective Etymology: galvanized iron; from abbreviation used in listing such articles as garbage cans, but taken as abbreviation for government issue Date: circa 1935 provided by an official United States military supply department , of, relating to, or characteristic of United States military personnel, conforming to military regulations or customs , II. noun (plural ~s or ~'s) Date: 1943 a member or former member of the United States armed forces, III. adverb Date: 1949 in a strictly regulation manner, IV. transitive verb (~'d; ~'ing) Date: 1951 to clean thoroughly (as floors) in preparation for or as if for a military inspection, V. abbreviation galvanized iron, gastrointestinal, general issue; government issue