define的名词形式为definition。define作为动词，意为“解释、给下定义、明确、界定、画出…的线条、描出…的外形”等；而definition作为名词形式，含义有“释义、定义、清晰度”。
一、define的含义及用法
define作为动词，意为解释(词语)的含义;给(词语)下定义;阐明;明确;界定;画出…的线条;描出…的外形;确定…的界线。
例句：Life imprisonment is defined as 60 years under state law.
按照州法律终身监禁定义为60年。
We need to define the task ahead very clearly.
我们需要明确今后的任务。
The mountain was sharply defined against the sky.
那座山在天空的衬托下显得轮廓分明。
We were unable to define what exactly was wrong with him...
我们说不清楚他到底哪里不对劲。
It is difficult to define what makes him so popular.
很难解释清楚什么原因使他如此走红。
We need to define the task ahead very clearly.
我们需要明确今后的任务。
It is difficult to define the border between love and friendship.
爱情和友情之间的界线难以划清。
二、definition的含义及用法
definition作为名词，意为(尤指词典里的词或短语的)释义，解释;定义;清晰度。
例句：What's your definition of happiness?
你对幸福的定义是什么？
The definition of the digital TV pictures is excellent.
数字电视图像的清晰度很高。
Can you give a more precise definition of the word?
你能给这个词下个更确切的定义吗？
We need to look at a more expansive definition of the term.
我们需要考虑这个词所包含的更广泛意义。
The legal definition of 'know' often presumes mental control
“知晓”的法律定义通常假定存在思维控制能力。
