This is the 1998th most frequent Chinese word.
纪
"纪" means "record," "age," or "discipline" in English.
In the sentence, '纪' is used in '纪录' (records), emphasizing the aspect of documentation or recording events and information.
这本书是关于历史纪录的。
This book is about historical records.
Here, '纪' is part of '世纪' (century), referring to a period of one hundred years as a unit of time measurement.
每十年就是一个新的世纪。
Every ten years constitutes a new century.
In this example, '纪' appears in '纪念' (commemorate), which expresses the act of remembering and honoring an event or person.