What does "comfort zone" mean?

The range of temperature, humidity, and other environmental factors that people or other organisms require in order to be physiologically unstressed.

What is a synonym for "comfort zone"?

Common synonyms include: cocoons, home soil, natural habitat.

noun

noun ·Rare ·Advanced level

Noun

1
The range of temperature, humidity, and other environmental factors that people or other organisms require in order to be physiologically unstressed.
"The child who swings between extremes has trouble finding the comfort zone—the area in which her body is comfortable, efficient, and alert."
2
the temperature range (between 28 and 30 degrees Centigrade) at which the naked human body is able to maintain a heat balance without shivering or sweating wordnet
3
The range of circumstances in which a person feels relaxed or able to cope. broadly, idiomatic
"The demanding interview panel took him well out of his comfort zone."

"The child who swings between extremes has trouble finding the comfort zone—the area in which her body is comfortable, efficient, and alert."