presidency       
noun [ C usually singular ] uk/ˈprez.ɪ.dən.si/ us/ˈprez.ɪ.dən.si/
B2 总统职务(或任期)
the job of being president, or the period when someone is a president
  He has announced that he is running for the presidency. 他已宣布参加总统竞选。 
 She won the presidency by a wide margin. 她以高额票数当选总统。 
 - More examples
 - Two main candidates are emerging as contestants for the presidency.
 - The presidency at last looked within her grasp .
 - The present constitution gives supreme authority to the presidency.
 - In a run-off for the presidency of the assembly, Santos beat Gutierez.
 - her long presidency