Duty
Task, Mission
noun
You have a duty. You have a task. You have both a duty and a task to do.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
美味しい混ぜご飯を作ることが、あなたの任務です。
Your task is to make a delicious mixed rice dish.
今朝のニュース番組で、キャスターが国会議員の任務について解説していたのを見ただけだよ。
I just watched a news programme this morning where the anchor was explaining the duties of Diet members.
任務完了前に撤退することは許されないとコウイチに言われました。
Koichi told me that I'm not allowed to leave before completing the mission.