Definition from macmillandictionary.com
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Leni suffered a stroke last year, and is unable to walk.
Winning the lottery was quite a stroke of luck.
Using green as a background was a real stroke of genius (=an idea that shows great intelligence).
These plans are seen as a bold stroke by the local council.
With each stroke of the whip, the horse galloped faster.
He slammed the ball over the net with a powerful backhand stroke.
With powerful strokes she pulled ahead of the others.
At the stroke of nine (=at exactly nine o’clock) the band began to play.
a brush stroke
She gave the dog’s head a stroke.
The tree was split by a stroke of lightning.