Meaning of jiè:
届
to arrive at (place or time); to become due
2024 nián shì wǒ bìyè de dì shí jiè.
2024年是我毕业的第十届。
2024 is the tenth time since I graduated.
Zhè cì huìyì yǐjīng jiè mǎnle.
这次会议已经届满了。
This conference has already come to an end.
period; classifier for events, meetings, elections, sporting fixtures, years (of graduation)
Zhè shì wǒ cānjiā de dì sān jiè yīnyuè jié.
这是我参加的第三届音乐节。
This is the third music festival I have attended.
Jīnnián shì wǒmen xuéxiào dì shí jiè bìyè diǎnlǐ.
今年是我们学校第十届毕业典礼。
This year is our school's tenth graduation ceremony.