The quality or state of being warm, comfortable, and snug; a pleasant feeling of being safe and intimate.
From cosy/cozy + -ness (quality of). British English spelling; the American 'coziness' is identical in meaning. Refers to that distinct comfort feeling.
Psychologists have noticed that 'cosiness' (especially the British concept of being 'cosy') is deeply tied to mental health—people actively seek out cosy spaces when stressed or anxious.
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