This is the 130th most frequent Chinese word.
首
"首" means "head," "first," or "leader."
In this sentence, '首' is used as a measure word specifically for poems or songs.
这是一首美丽的诗。
This is a beautiful poem.
Here, '首' has the meaning of 'head' or 'leader', indicating someone in charge or the primary figure.
他是我们的首领。
He is our leader.
In this usage, '首' conveys the meaning of 'primary' or 'first in importance', describing priority.