| A | B |
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| Accuracy | The condition or quality of being true, correct, or exact; precision; exactness. The degree of correctness of a quantity or expression. |
| Customary System | Also referred to as the English system of measuring. The measuring system based on the foot, second, and pound as units of length, time, weight, or mass. |
| Denominator | Divisor; the number below the line in a fraction. |
| Caliper | A measuring tool with two usually adjustable jaws used especially to measure thickness or diameter. |
| Diameter | A straight line passing from side to side through the center of a circle or sphere. |
| Measurement | Collecting data in a quantifiable manner. |
| Metric System | The decimal measuring system based on the meter, liter, and gram as units of length, capacity, and weight or mass. |
| Micrometer | A gauge which measures small distances or thicknesses. |
| Numerator | The number above the line in a fraction showing how many of the parts indicated by the denominator is taken. |
| Precision | The degree to which several measurements or calculations show the same or similar results. |
| Unit | A standard quantity in terms of which other quantities may be expressed. |
