This is the 149th most frequent Chinese word.
一定
"一定" means "certainly," "definitely," or "must."
Here, '一定' expresses strong confidence or assurance that the event will occur.
他明天一定会来参加会议的。
He will definitely come to the meeting tomorrow.
In this context, '一定' serves to emphasize the importance or obligation of enduring efforts.
在学习新的技能时，你一定不要放弃。
When learning new skills, you must definitely not give up.
In this sentence, '一定' indicates strong certainty or necessity, conveying the importance of finishing the homework on time.