term:

Presidency

presidency n

pl: -cies
1 a : the office of president
b : the office of president of the U.S.
;also
: the American governmental institution comprising the office of president and various associated administrative and policy-making agencies
2 : the term during which a president holds office
3 : the action or function of one that presides

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.