contour interval

noun
the difference in elevation represented by each contour line on a topographic map.
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World English Dictionary
contour interval
 
n
the difference in altitude represented by the space between two contour lines on a map

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Contour interval is always a great word to know.
So is bezoar. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Dictionary.com's 21st Century Lexicon
Main Entry:  contour interval
Part of Speech:  n
Definition:  any of the spaces between vertical lines on a topographic map or globe; the difference in elevation such an interval represents
Example:  Small contour intervals are used for flat areas; larger intervals are used for mountainous terrain.
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Example sentences
The space between the contour lines represents a set distance, called the
  contour interval.
Systematic errors may not exceed one contour interval, determined by the source
  map, is the maximum permitted.
The contour interval of the map tells the difference in elevation between two
  adjacent lines.
As the contour interval number increases the terrain is more elevated.
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