Source : Webster's Revised Unabridged Dictionary (1913)

Presidentship \Pres"i*dent*ship\, n.
   The office and dignity of president; presidency. --Hooker.

Source : WordNet®

presidentship
     n : the office and function of president; "Andrew Jackson
         expanded the power of the presidency beyond what was
         customary before his time" [syn: {presidency}]