Repeatability -

• Measurement - A statistically quantitative measure of how close any given measurement in a succession of same measurements will be to the most common measurement. For a particular statistical relation, such as gaussian, the repeatability may include a mathematical parameter such as "The 3 sigma positional repeatability is 2 micrometers" etc.
• Machine - A statistically quantiative measure of the ability to consistently place a machine in a given state using the same input values (such as the ability to place a tool or probe to the same location with respect to the workpiece given the same machine coordinates)
• Manufacturing - A statistically quantiative measure of the ability of an operating manufacturing process to produce the same effect (such as cut a slot the same size or grow a surface oxide the same thickness) The process can be producing out-of-tolerance parts and yet be producing them repeatably.