This is the 488th most frequent Chinese word.
理
"理" means "reason," "principle," "logic," or "to manage."
In this sentence, '理' is used as a verb meaning 'to organize' or 'to tidy up'.
我需要理一理我的书桌。
I need to organize my desk.
Here, '理' is used as a noun within the term '道理', meaning 'reason' or 'logic'.
这件事情没有道理。
This matter does not make sense.
In this example, '理' appears within the word '理发', serving as part of the compound verb meaning 'to cut hair'.