勤務 is read as きんむ (kimmu) and means service.
きんむ
kimmu
きんむじかん
office hours
きんむちゅう
on duty
きんむち
duty station
きんむちてあて
area allowance
きんむいん
worker
きんむこうたい
change of shifts
きんむしゃ
workers
きんむばしょ
workplace
きんむさき
place of employment
きんむねんげん
term of service
きんむい
doctor working in a hospital
にっちゅうきんむ
daytime work