WordNet sense 1 (the tenure of a president):

presidency, presidential term

WordNet sense 2 (the persons (or committees or departments etc.) who make up a body for the purpose of administering something):

brass, establishment, governance, organization, organisation, governing body

WordNet sense 3 (a method of tending to (especially business) matters):

disposal

WordNet sense 4 (the act of administering medication):

giving medication