This is the 1913th most frequent Chinese word.
定义
Definition of something; to define.
In this sentence, "定义" is used to specify the concept or term itself, explaining its function.
定义是一个词汇，用来描述事物的意思。
Definition is a term used to describe the meaning of things.
Here, "定义" is used as a verb, meaning to establish or specify the description of something formally.
科学家给这种新发现的现象定义为一种自然规律。
Scientists define this newly discovered phenomenon as a natural law.
"定义" in this sentence is employed as a concept related to explaining or understanding terms effectively.