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I'm not absolutely certain, but I think I'm right.
You can be pretty certain she's not going to like it.
We still can't be certain who is going to win.
I've never been more certain of anything in my entire life.
You don't seem too certain about it.
I think I met her in 1985, but I can't say for certain.
They face certain death if they are sent back to their home country.
Success is by no means certain.
Interest rates seem certain to rise next month.
It's not certain that this method would have worked.
Mexico is now certain of a place in the finals.
This is the British English definition of certain. View American English definition of certain.
an extra sail sometimes fitted on the front of a boat used for racing