This is the 460th most frequent Korean word.
사상
"사상" means "thought" or "ideology."
Here, '사상' refers to 'thought' or 'concept', denoting historical and intellectual movements or ideas.
한국 역사에 중요한 사상을 소개합니다.
I introduce important ideas in Korean history.
In this sentence, '사상' is used idiomatically to indicate 'in history' or 'of all time', modifying the intensity or extent of an event.
이번 홍수는 사상 최대 규모였다.
This flood was the largest ever.
In this sentence, '사상' is used to mean 'ideology' or a set of beliefs, describing someone's philosophical perspective.