Final answer:
A measurement is a method for describing a variable's quantity, providing a number, a unit, and a measure of uncertainty.
Step-by-step explanation:
A measurement is a method for describing a variable's quantity. It is the assignment of a number to a characteristic of an object or event, which can be compared with other objects or quantities. Measurements provide three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. For example, distance and time are defined by specifying methods for measuring them, while average speed is calculated as distance traveled divided by time of travel.