The quality or state of being clean; freedom from dirt, stains, or contamination; purity.
From 'clean' + abstract noun suffix '-ness.' This pairing dates to Old English and creates a noun describing the abstract quality of cleanliness.
In Japanese aesthetics, 'cleanness' (seisou) is a spiritual concept tied to respect and honor—when samurai committed suicide, cleanliness of ritual was as important as the act itself.
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