This is the 512th most frequent Chinese word.
单位
"单位" means "unit" or "workplace/organization."
In this sentence, '单位' refers to a workplace or organization where someone is employed.
我昨天去我的单位开会。
Yesterday, I went to my work unit for a meeting.
Here, '单位' is used to indicate a measurement unit, specifically to describe length.
这条绳子的单位长度重量很轻。
This rope's unit length weight is very light.
In this context, '单位' stands for a division or section, such as an entity or institution, within the city.