1. 总统职位；总裁职位；主席职位
The presidency of a country or organization is the position of being the president or the period of time during which someone is president.

e.g. Britain will support him as a candidate for the presidency of the organisation...
英国会支持他竞选这个组织的主席职位。
e.g. Poverty had declined during his presidency.
在他担任总统期间，贫困人口减少了。

noun

1. the office and function of president

e.g. Andrew Jackson expanded the power of the presidency beyond what was customary before his time

Synonym: presidentship

2. the tenure of a president

e.g. things were quiet during the Eisenhower administration

Synonym: presidential termadministration