决心的定义用英语怎么说

决心的英文定义是 "determination"。这个词来源于拉丁语 "determinatio"，意思是 "确定" 或 "决定"。
例句：
She showed great determination in completing the project on time. (她在完成项目的时间表上表现出了巨大的决心。)
He had the determination to succeed, no matter what obstacles he faced. (他有着成功的决心，不管面对什么障碍。)
With determination and hard work, she was able to achieve her goals. (凭借决心和努力，她成功地实现了她的目标。)