The term STANDARD OF MEASUREMENT can be broken down into four crossword solutions: UNIT (4 letters), NORM (4 letters), YARDSTICK (9 letters), and METRIC (6 letters). A UNIT is a standard quantity used as a basis for measurement, such as inches, feet, or miles. A NORM is a standard of behavior or attitude that is accepted as normal or desirable. A YARDSTICK is a measuring device, usually a long thin stick marked with units of length, used to measure distances. Finally, the metric system is an international decimal system of measurement based on the meter, kilogram, and second.