1. any continuous area that differs in some respect, or is distinguished for some purpose, from adjoining areas, or within which certain distinctive circumstances exist or are established: The decisions were formulated in a zone of uncertainty. The temperature lies outside the danger zone.
2. any of five great divisions of the earth's surface, bounded by lines parallel to the equator and named according to the prevailing temperature.
3. an area characterized by a particular set of organisms, whose presence is determined by environmental conditions, as an altitudinal belt on a mountain.
4. a horizon.
5. a part of the surface of a sphere included between two parallel planes.
6. a specific district, area, etc., within which a uniform charge is made for transportation, mail delivery, or other service.
7. the total number of available railroad terminals within a given circumference around a given shipping center.
8. an area or district in a city or town under special restrictions as to the type, size, purpose, etc., of existing or proposed buildings.
9. time zone.
10. (in the U.S. postal system) any of the numbered districts into which a city or metropolitan area was formerly divided for expediting the sorting and delivery of mail.
11. a particular portion of a playing area: The wing was trapped with the puck in his own defensive zone.
12. a state of intense concentration and focus that greatly improves a person's performance in a physical or mental activity, especially in sports: He has a great golf swing, but he needs to be in the zone.
13. a girdle or belt; cincture.

14. to mark with zones or bands.
15. to divide into zones, tracts, areas, etc., as according to existing characteristics or as distinguished for some purpose.
16. to divide (a city, town, neighborhood, etc.) into areas subject to special restrictions on any existing or proposed buildings.
17. to encircle or surround with a zone, girdle, belt, or the like.

18. to be formed into zones.

19. to become inattentive or dazed: I must have zoned out toward the end of the lecture.

1. a region, area, or section characterized by some distinctive feature or quality
2. a sphere of thought, disagreement, argument, etc
3. an area subject to a particular political, military, or government function, use, or jurisdiction
4. one of the divisions of the earth's surface, esp divided into latitudinal belts according to temperature
5. a distinctive layer or region of rock, characterized by particular fossils (zone fossils), metamorphism, structural deformity, etc
6. an area, esp a belt of land, having a particular flora and fauna determined by the prevailing environmental conditions
7. a portion of a sphere between two parallel planes intersecting the sphere
8. sport
• a mental state that enables a competitor to perform to the best of his or her ability
• of or relating to competitive performance that depends on the mood or state of mind of the participant
9. a girdle or belt
10. a section on a transport route; fare stage
11. a catchment area for pupils for a specific school
12. in the zone See zone (def. 8)

13. to divide into zones, as for different use, jurisdiction, activities, etc
14. to designate as a zone
15. to mark with or divide into zones
16. to establish (an area) as a zone for a specific school

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