1. 正午;中午
Noon is twelve o'clock in the middle of the day.
e.g. The long day of meetings started at noon...
会议接连不断的漫长一天从中午开始。
e.g. Our branches are open from 9am to 5pm during the week and until 12 noon on Saturdays.
我们的分行每周一至周五上午9点到下午5点营业，周六营业到中午12点。
2. 正午的;中午的
Noon means happening or appearing in the middle part of the day.
e.g. The noon sun was fierce...
正午的阳光火辣辣的。
e.g. He expected the transfer to go through by today's noon deadline.
他希望转账在今天中午的最后期限之前完成。
3. morning, noon, and night -> see morning