0 used to say ‘yes’ strongly, often to be polite -- もちろん!
‘Can you help me?’ ‘Of course!’
1 used to show that what you are saying is obvious -- もちろん
Of course, the Olympics are not just about money.
2 used to say ‘no’ strongly -- もちろん~しない
3 a set of lessons about a particular subject -- 講座
She did a ten-week computer course.
4 a part of a meal -- (食事の)コース
a three-course dinner
5 an area used for horse races or playing golf -- (競馬やゴルフの)コース
a golf course