Maybe I can confuse things even more here. Most scope makers say their clicks are 1/4 minute, or 1/8 minute, or whatever. Minutes are a measure of angle. Everybody knows there are 360 degrees in a circle and 90 degrees in a right angle, i.e. between horizontal and vertical. A degree is broken down into 60 minutes. (No decimal system here.) Think of how an hour is further broken down into 60 minutes, not into tenths or hundreadths.
As an absolute stroke of pure luck, 1 minute of angle is almost exactly 1 inch at 100 yards. This makes it real convenient for us to talk about minutes and inches as if they were the same. This only works at 100 yards. An inch is an inch, whether at the muzzle or at 100 miles, whereas a minute is an inch at 100 yards, 2 inches at 200, 10 inches at 1000 yards, etc.
All the above aside Rich is right about many scope makers not making their clicks what they say they are.