관습이 · 관습을
custom, convention
Example
나라마다 인사하는 관습이 달라요.
Customs for greeting people differ from country to country.
Word parts
관 accustomed+습 habit
Literally 'accustomed habits' — what a society usually does.
Good to know
관습 is a society's convention; a personal habit is 습관, the same syllables reversed.
Related words