mid-14c., "act of giving or dispensing;" late 14c., "management (of a business, property, etc.), act of administering," from Latin administrationem (nominative administratio) "aid, help, cooperation; direction, management," noun of action from past-participle stem of administrare "to help, assist; manage, control, guide, superintend; rule, direct," from ad "to" (see ad-) + ministrare "to serve, attend, wait upon," from minister "inferior, servant, priest's assistant" (see minister (n.)).
Early 15c. as "management of a deceased person's estate under a commission from authority." Meaning "management of public affairs" is from 1680s; hence, "executive power in a government" (1731), though later in Britain government was used in this sense. Meaning "a U.S. president's period in office" is first recorded 1796 in writings of George Washington.
The administration of government, in its largest sense, comprehends all the operations of the body politic, whether legislative, executive, or judiciary; but in its most usual, and perhaps in its most precise, signification, it is limited to executive details, and falls peculiarly within the province of the executive department. [Federalist No. 72 (Hamilton)]