비중이 · 비중을
proportion, share; weight, importance
Example
전체 인구에서 노인이 차지하는 비중이 커지고 있어요.
The share of elderly people in the total population is growing.
Word parts
비 compare+중 weight
Literally 'compared weight': how heavy one part is relative to the whole.
Good to know
Usually paired with 차지하다: 비중을 차지하다 'to account for a share'.