Official business or public duties — tasks or responsibilities carried out by government or public institutions.
彼は公務で海外に出張している。
He is on an official business trip abroad.
公務中の事故は速やかに報告しなければならない。
Accidents that occur during official duties must be reported promptly.
市長は公務として学校を視察した。
The mayor inspected the school as part of official duties.