This is the 738th most frequent Korean word.
이전에
"Before" or "previously."
Here, '이전에' indicates 'before', speaking about a past experience.
저는 이전에 그 사람을 만난 적이 있습니다.
I have met that person before.
In this case, '이전에' refers to a prior point in time in relation to the mentioned action.
이전에 시작했던 프로젝트를 마무리해야 합니다.
We need to finish the project we started earlier.
Here, '이전에' is used to establish a context of 'at no earlier point', emphasizing anticipation.