개교establishment of a school 개교기념일school anniversary 개교식school opening ceremony 개발development; exploitation 개발비development expense 개방opening; opening to the public 개봉관first-run theater 개봉작new release 개업의private practice physician 개원opening of a hospital; opening of an institute

시작start; beginning 개시일D-day; opening day 시구first pitch of a baseball game 시동start; initiate 시말서written apology and explanation 시무식meeting to launch the New Year 시발departure 시발점departure point 시점starting point 시조progenitor; root