A stroke in its' simplest terms is an attempt to hit the golf ball, this includes air shots, if you swing and miss, that is one stroke also.
One stroke is one shot or attempted shot.
Basically a stroke is where a genuine movement is made towards the golf ball. Once you address the ball and make a swing, this counts as a stroke, even if you miss it.
If you intend to hit the golf ball then yes, but if a obscure movement is made to avoid the golf ball for an apparent reason then it would not count as a stroke.
You start a hole of golf by making a stroke with any golf club from the defined teeing area.
Whiff is to miss the ball entirely on a stroke. : (
Two stroke penalty.
Lose a stroke
one stroke below par for gien hole