The plural of familiarity; multiple instances of knowing something well or being comfortable with something.
From familiarité (Old French) → familiar (English adjective) → familiarity (noun) → familiarities (plural). The -ity suffix creates nouns from adjectives.
Familiarities are the small comforts that make places feel like home—the creaky stair, the coffee mug pattern, the neighbor's voice. Neuroscience shows our brains release calming hormones when we encounter familiar patterns.
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