agencymeans— but does not include—
Governmentmeans the Government of the United States and the government of the District of Columbia.
Presidential election periodmeans any period beginning on June 1 in a calendar year in which the popular election of the President occurs, and ending on January 20 following the date of such election;
senior career employeemeans an individual appointed to a position classified above GS–15 and paid under section 5376 who is not serving—
senior politically appointed officermeans any officer who during a Presidential election period serves—