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time zone a region in which all the clocks are set to the same time. The earth is divided into twenty-four time zones. The time in each zone is one hour earlier than it is in the zone to its east.
Zip Code (Trademark) Zip Code is a U.S. Postal Service system that uses a code of five or more numbers to identify every postal delivery area in the United States. Zip stands for "Zone Improvement Plan."
zone any of the five areas of the earth's surface, marked by latitude lines, and named according to the region's temperature. There are two frigid zones, two temperate zones, and one torrid zone. [1/3 definitions]