the act of officially putting someone into an important position, or the ceremony at which this is done

He watched the inauguration of his country's new president. 他观看了新总统的就职典礼。

When is the inauguration? 就职典礼什么时候举行？

an inauguration ceremony 就职典礼

the act of something officially starting to be used

In 1900 Paris saw the inauguration of the Metro. 1900年，巴黎迎来了地铁的开通。

the beginning of a new period, style, or activity

It was the inauguration of a new era in American life. 这是美国生活新时代的开始。