This is the 113th most frequent Chinese word.
每
"Each" or "every."
Here, '每' is used as a determiner meaning 'every' to describe the frequency of an event happening in a given period.
我每周工作五天。
I work five days every week.
In this sentence, '每' is part of an adverbial phrase '每次' meaning 'every time', indicating repetition in a temporal context.
天气在每次下雨后变得很清新。
The weather becomes very fresh after every rain.
In this sentence, '每' is used as a pronoun meaning 'every' to indicate each individual in a group.