of course A1 used to say ‘yes’ strongly, often to be polite: ‘Can you help me?’ ‘Of course!’
of course B1 used to show that what you are saying is obvious: Of course, the Olympics are not just about money.
of course not A2 used to say ‘no’ strongly: ‘Do you mind if I borrow your pen?’ ‘Of course not.’
A1 a set of lessons about a particular subject: She did a ten-week computer course.
A2 a part of a meal: a three-course dinner
B1 an area used for horse races or playing golf: a golf course
› the direction in which a ship, plane, etc. is moving: The boat was blown off course (= in the wrong direction).
› the way something develops, usually over a long time: Nuclear weapons have changed the course of history.