Presidency (noun)

1. The office or term of a president.
2. The period during which a president holds office.
3. The executive branch of government, headed by a president.

Origin:

From latin praesidentia, from praesidens, praesidentis, present participle of praeesse ("to preside over").

Examples:

1. He took office as the President during his presidency.
2. She was elected to the presidency with a majority of the popular vote.
3. The presidency is a powerful institution in the government.
4. The opposition party won the presidency in the last election.
5. The presidency has the authority to veto or sign bills into law.