Collins
World English Dictionary
comfort zone
 
n
a situation or position in which a person feels secure, comfortable, or in control: encouraging people to work outside their comfort zone

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  comfort zone1
Part of Speech:  n
Definition:  the range of temperature within which an environment is comfortable for most people with no heating or cooling necessary; also for humans, 28-30 degrees C, at which the naked body can maintain heat balance without sweating or shivering; the range of atmospheric temperature and humidity within which the human body feels and works comfortably and efficiently, typically 19-24°C
Example:  The comfort zone is often described as 55° to 70°F with a humidity of 30 to 55 percent.
Main Entry:  comfort zone2
Part of Speech:  n
Definition:  an environment or situation in which a person feels secure or at ease; also figuratively, an established lifestyle in which a person feels comfortable as long as there is no drastic change
Dictionary.com's 21st Century Lexicon
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American Heritage
Medical Dictionary

comfort zone com·fort zone (kŭm'fərt)
n.
The temperature range between 28° and 30°C or 82.5° and 86°F at which the naked body maintains heat balance without shivering or sweating; in the clothed body, the range is between 13° and 21°C or 55.5° and 70°F.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But their comfort zone is furnished with self-deception.
Stepping out of comfort zone is a huge challenge for students.
Sure, he was talking about subjects within his comfort zone, such as
  deregulation and tax policy.
People can put up a lot of hardship in terms of living quarters even in today's
  taken-for-granted comfort zone.
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