Solution:

Repeatability:

The measure of the ability of the robot to position the tooltip the same place repeatedly.

Repeatability is the ability of a robot to repeatedly position itself when asked to perform a task multiple times. Accuracy is an absolute concept, repeatability is relative.

Note that a robot that is repeatable may not be very accurate.

Likewise, an accurate robot may not be repeatable.

Precision:

Precision is the 'fineness' with which a sensor can report a value.

The measure of the spatial resolution with which the tool can position within the work envelope.

For example, a sensor that reads $2.1178$ is more precise than a sensor that reads $2.1$ for the same physical variable.

Precision is related to significant figures.

The number of significant figures is limited to the least precise number in a system of sensing or a string of calculations.

Reach:

The horizontal reach maximum radial distance is positioned from the vertical axis about which the robot rotates.

There are two types of reaches:

1) Horizontal reach

2) Vertical reach

Horizontal reach :

It is defined as the distance the arm can travel in the horizontal direction

Vertical reach :

It is defined as the distance the arm can travel in the vertical direction

Stroke:

This brain-controlled robotic arm requires no surgery and is accessible to robotically guide stroke rehabilitation both in the clinic and at home.

Horizontal stroke:

That is the difference between the maximum and minimum horizontal reach.

Vertical stroke:

That is the difference between the maximum and minimum vertical reach.

Accuracy:

Accuracy is the ability of a robot to go to the specified position without making a mistake. It is impossible to position a machine exactly.

Accuracy is therefore defined as the ability of the robot to position itself to the desired location with minimal error (usually $0.001$ inch).