of ˈcourse S1 W1 adverb

1. used to show that other people probably already know what you are saying is true, or expect to hear it:
Well, she won, of course.
You should of course keep copies of all your correspondence.
Of course there will be some difficult times ahead.

2. spoken (also course informal) used to emphasize that you are saying ‘yes’ when someone asks your permission to do something:
‘Can I ring you back in a minute?’ ‘Yes, of course.’
‘Is it OK if I have another cup of coffee?’ ‘Course, help yourself.’

3. spoken (also course informal) used to emphasize that what you are saying to someone is true or correct:
‘Do you really believe her?’ ‘Of course I do!’
‘I hope this idea of yours works.’ ‘Course it’ll work.’

4. spoken used to show that you accept or agree with what someone has just said:
‘Don’t get angry. She’s only 13.’ ‘Of course.’
‘The correct answer is 83.’ ‘Oh, yes, of course.’

5. of course not/course not spoken used to emphasize that you are saying ‘no’ to something:
‘Have you been reading my email?’ ‘Of course not!’
‘Do you mind if I bring a friend?’ ‘No, of course not.’

[TahlilGaran] Dictionary of Contemporary English ▲

of course
adverb
See COURSE 3 (course)

[TahlilGaran] Dictionary of Common Errors ▲

of course
1.
obviously yes.
“May I use your telephone?” “Of course, go right ahead.”

Usage notes: often used in the phrase of course not - obviously no:
“Is she really going to leave without paying?” “Of course not.”

2.
it is obvious.
Of course you should call the doctor if she starts feeling worse.

[TahlilGaran] English Idioms Dictionary ▲

of course
certainly, definitely, naturally
"Of course you can use my car if you want to."

[TahlilGaran] English Idioms Dictionary ▲

of course
adv. phr.
1. As you would expect; naturally.
Bob hit Herman, and Herman hit him back, of course.
The rain came pouring down, and of course the track meet was canceled.
2. Without a doubt; certainly; surely.
Of course you know that girl; she's in your class.

[TahlilGaran] English Idioms Dictionary ▲